The  first Web 2.0 Conference held in San Francisco in October 2004 ,  shortly after Google's initial public offering - the biggest IPO of a  technology firm since the second dotcom boom, had created a stir.  Google’s IPO did not just announce Silicon Valley’s return to Wall  Street. It also unveiled a new business model. When Google at last  revealed just how much money it was making by placing small, targeted  text advertisements next to search results, jaws dropped. Overnight,  every entrepreneur had learnt a new one-word pitch to venture  capitalists: advertising.[1]

Indeed,  Web 2.0 today still seems to have only one business model -  advertising, and the Valley needs to admit that only one company  (Google) with only one of its products (search advertising) has proved  that the model really works. Google's search dominance made CPC based  advertising the de-facto monetization standard on the web. Yahoo and AOL  also did their best to grab a piece of the action. In this pursuit of  "eyeballs", a series of new internet stars emerged: MySpace, YouTube,  Facebook, Twitter. Each provided a free service in order to attract a  large audience that would then—at some unspecified point in the  future—supposedly attract large amounts of advertising revenue. It had  worked for Google, after all, and ought to work for the others. But the  reality, it turns out, is that the number of companies that can be  sustained by revenues from internet advertising is much smaller than  many people thought. Not one of them has really become an advertising  success in its own right.[1]

In the words of  silicon valley investor Dave McLure, "What has all this  Don't-Be-Evil-AdWords-Click-Happiness done to the internet & startup  ecosystem? It's made us a bunch of lazy, ad-happy, Web-Tards with  crappy ROI. So crappy in fact, we should be ashamed to call ourselves  entrepreneurs & venture capitalists." He thinks that "We have  largely WASTED an entire web decade of time, energy & venture  capital on extremely inefficient revenue models.  There have been a few  interesting examples of startups acquired in the early 2000s for large  amounts due to amazing growth (eGroups, MySpace, Skype, YouTube) or  advertising potential (aQuantive, DoubleClick, AdMob, RightMedia).   However, mostly the decade has been an uninterrupted string of  uninspiring business models and small-time acquisitions of Web 2.0  startups filled with rainbows & unicorns, rather than those based on  simple, transactional revenue models."

From The end of the free lunch (The Economist): The  idea that you can give things away online, and hope that advertising  revenue will somehow materialize later on, undoubtedly appeals to users,  who enjoy free services as a result. There is of course business logic  to it, too. Due to the nature of the internet the barrier to entry for  new companies becomes very low. In the ads world, the minority of  customers who pay subsidize the majority who do not. The internet also  allows companies to exploit network effects to attract and retain users  very quickly and cheaply(mostly for free). So it is not surprising that  rival search engines, social networks or video-sharing sites give their  services away in order to attract users, and put the difficult question  of how to make money to one side. If you worry too much about a revenue  model early on, you risk being left behind.[2]
Ultimately,  though, every business needs revenues—and advertising, it transpires,  is not going to provide enough. Free content and free services are a  fanciful idea. But the lesson of two internet bubbles is that somebody  somewhere is going to have to pick up the tab for lunch.[2]
A  common theme faced by VCs backing potential startup ideas is an  abundance of driven entrepreneurs brimming with energy to build  something meaningful and cool, and without an eye out for the proverbial  pot of gold at the end of the rainbow, which would - well - seem  altruistic and good. But in one such advisor's own words "Time  after time, I have asked "interesting idea, but how are you going to  monetize it?" and received back flowery explanations that boiled down to  "advertising" or, worse, AdSense. One group was even more disconnected,  explaining that their goal was to build a large community of users,  then they'd "figure out" how to make money. A busy site can certainly  make for a great hobby, a fun project to fiddle with, and maybe a few  bucks at the end of the month, but (with precious few exceptions) that's  not a business. Further, while there might be high-flying estimates of  future advertising revenue in the online world, it isn't often  highlighted that the competition is going to get tougher too. A  company like IBM might spend millions on advertising, but their money is  going to skew towards a small number of large sites, NOT a large number  of small ones, meaning that unless you want to build a business on the  nickel and dime PPC payouts of Google's AdSense, AuctionAds, and  related, you've got a fundamental problem in your business model."

Hence Advertising, it would seem today, is the standard business model for Web companies that basically don't actually  have a business model. Folklore has it that a popular service will have  lots of users, and a few ads on the side ought to pay the bills. Two  problems have emerged with this model: the price of online ads and  click-through rates. Facebook is an amazingly popular service, but it  also an amazingly ineffective advertising platform. Even if one  could  figure out what the right ad to serve next to a high-school party  pictures might be, a person's friends probably won't click on it. No  wonder Facebook applications get less than $1 per 1,000 views ,compared  to around $20 on big media Web sites.[3]
In  the old boom days the model was pretty simple. 1. Have a great idea. 2.  Raise money to bring it to market, ideally free to reach the largest  possible market. 3. If it proves popular, raise more money to scale it  up. 4. Repeat until you're bought by a bigger company. In today's  tougher climate and dried up VC funding, steps 2 through 4 are no longer  available. So Web startups are having to do the unthinkable: come up  with a business model that brings in real money while they're still  young. This is actually nothing new in the world of business. But it is a  bit of a shock in the Web world, where "attention" and "reputation" are  the currencies most in demand, with the expectation that a sufficient  amount of either would turn into money someday, somehow.[3]

Also,  there have been experts who in fact, contend that there is a  fundamental flaw in the very belief that advertising alone can yield  revenues. Wharton Professor Eric Clemens argues that  the Internet shatters all forms of advertising. “The problem is not the  medium, the problem is the message, and the fact that it is not  trusted, not wanted, and not needed,” he writes. He obviously goes  beyond the contentious realm of seeking online advertising as a viable  business model, and instead questions the hype around advertising  itself. He suggests that simple commercial messages, pushed through  whatever medium, in order to reach a potential customer who is in the  middle of doing something else, will fail. "It’s not that we no longer  need information to initiate or to complete a transaction; rather, we  will no longer need advertising to obtain that information.  We will see  the information we want, when we want it, from sources that we trust  more than paid advertising." He contends that better targeting of ads  using individual interests and individual behaviors will ensure that we  do not bore or annoy as many people with each ad, but still cannot  address the trust issue. As for paid search, it is closer to other  mechanisms that allow a website to sell access to potential customers.  It works effectively as a revenue source for Google, of course. But it  surely is not replicable for the average content website.
Eric argues that there are categories  for creating value that can be monetized, including selling real  things(think Amazon), selling virtual things(think Second Life,  participation in virtual communities like Facebook), and selling  access(recommendations on rating sites as TripAdvisor).
But  does this mean that the proverbial "Free" will retreat in a down  economy? Not necessarily. According to Chris Anderson, author of Free: The Future of a Radical Price,  the psychological and economic case for it remains as good as ever --  the marginal cost of anything digital falls by 50% every year, making  pricing a race to the bottom, and "Free" has as much power over the  consumer psyche as ever. But it does mean that Free is not enough. It  also has to be matched with Paid. "Just as King Gillette's free razors  only made business sense paired with expensive blades, so will today's  Web entrepreneurs have to not just invent products that people love, but  also those that they will pay for", he says.[3]

However,  there is another, more significant change that is happening to the  evolving internet landscape. The golden age of the Web - a unified  aggregation of sites people accessed using standard or similarly  formatted PCs and browsers, is being replaced slowly by new-age iPhones,  Androids, Kindles, Tablets, and TVs connecting to the Web. The whole  framework of the Web(and thus web based marketing) is based on the  premise that everything is compatible in format. Now, suddenly, Apps  that work on the iphone, don't work on Android. Widgets for FiOS TV  don't work anywhere else. Also, more and more of the interesting content  on the Web is increasingly hidden behind passwords - such as in  Facebook. Analysts at Forrester research have  coined this fragmented internet landscape as the 'Splinternet'. "The  standardized Web established links, click-throughs, and analytics, and  in turn gave rise to now mainstream interactive marketing tools like  online advertising, search marketing ads, and e-mail marketing," they  write. Forrester figures that in the U.S. alone, marketers poured $25.6  billion into these technologies last year. This will change now as  marketers will have to move with caution through the new world of  duelling devices, applications and standards. Investments in one cannot  be easily transferred to another if one makes a mistake. In the era of  the unified Web, if a company chose to advertise on a poorly performing  site it could move its ads to another site. In the Splinternet, there  may be no choice but to start from scratch. This will lead to a rethink  in analytics, links and measurement as the new environment(s) unfold.  Apple recently announcing a new iAd platform for the iPad, is already  indicative of what the siloed, fragmented nature of advertising within  an ecosystem with boundaries may look like.