The U.S. online display advertising market saw a revival in 2010, with an estimated growth of 17% over 2009. Continued growth means greater competition amongst players like Yahoo! (YHOO), Facebook, Google (GOOG), Aol (AOL) and New York Times (NYT).

We currently maintain a $17.88 price estimate for Yahoo, in line with market price. Display advertising accounts for roughly 18% of Yahoo's stock value by our estimates.

Twenty-six percent of businesses using Twitter say they'd pay for the right services, and that might just be good enough.

WebBizIdeas.com polled 850 Twitter business users about what services would lead them to pry open their wallets. Three quarters of them said they either weren't crazy or were unsure about paying for additional features like analytics (31% and 43%, respectively), which sounds like a menacing amount. Yet, the size of this social media environment may make the 26% sufficient.

Twitter's a pretty lucky company. Few get two bytes at the hype apple in rapid succession, but this social media platform has found a way to make up for its disappointing announcement about its advertising model. According to VentureBeat, Twitter might unveil its long-awaited, heavily-hyped and possibly investor-satisfying corporate accounts. Next month, at its inaugural Chirp developer conference, we could finally see what might just be the foundation of Twitter's business model.

Apparently, all the hype wasn't worth it. After Twitter COO Dick Costolo explained that the company was going to unveil a "non-traditional" advertising model and claimed that "people will love it," what we're seeing is a foray into decidedly charted territory.

According to AllThingsD, Twitter's ad model will resemble the one that has been so successful for search and online ad giant Google (GOOG). Ads, essentially, will be tied to search.

Yawn.

So far this year, the IPO market has been miserable. Even fast-growing companies are having troubles.

Just look at QuinStreet (QNST), which hit the markets today.

The company wanted to issue 10 million shares at $17-$19 but was only able to price the deal at $15. So far in today's trading, the stock price is unchanged.

The New York Times (NYT) has been struggling to figure out the web, which has led to a debate over whether to charge for electrons that has spanned years. Well, the Times seems likely to take the plunge, hoping to replicate the successes of the Financial Times and Wall Street Journal ... except, of course, that the Wall Street Journal is famous for not really delivering profits. Fortunately, the new pay wall is expected to look more like the Financial Times than the Wall Street Journal. The New York Times is considering a "metered" system. Visitors will be able to read a certain number of articles free before being required to subscribe.

A friend of Arthur Sulzberger, according to New York Magazine's Daily Intel, said that the final word could come in a few days, a sentiment corroborated by a newsroom source who said that the plan could be announced within weeks. Yet, plans need to be implemented, so it could take months for the Times to begin charging for content.

Google (GOOG) just picked up another promising startup in its effort to gain some ground in the online visual advertising market. Teracent, which was formed three years ago, is becoming part of the search engine giant.

Yahoo! (YHOO) currently leads the market in display advertising sales, and Google has been trying push into the space. Last year, this led to its acquisition of online ad service DoubleClick, but that was a first step rather than a total solution to Google's display ad ambitions.

Twitter is on the prowl. Though it made its last acquisition more than a year ago, company founder Biz Stone said on Tuesday that it's looking to add to the stable. There aren't any specific targets yet -- at least none revealed -- and Twitter is keeping its options open. The likely pool of potential acquisitions consists of third-party Twitter application developers, which is largely responsible for the micro-blogging service's growth in popularity.

Stone, one of Twitter's founders, said at a Tel Aviv news conference, "As our attention is grabbed by some of these developers, we will take a hard look at them." This refers to companies that develop applications for Apple's (AAPL) iPhone and Research in Motion's (RIMM) Blackberry. It also refers to developers for the Web and desktop, such as HootSuite and TweetDeck.

Twitter calls Google (GOOG) a "good role model," but says it isn't ready to rush down the road to advertising.

Nonetheless, an ad-based revenue model is something that cofounder Biz Stone says they "will be looking to do down the line." But, for now, he continues, Twitter is focused on "creating value for our users." For now, revenue generation ideas are being put on paper, "and we're definitely going to get to them," Stone says.

We've put three quarters behind us in 2009, and the most recent one was merely another miserable step downward for the beleaguered newspaper industry. Total ad revenue plummeted in the third quarter to $6.4 billion for the print jockeys, a decline of 28%. This info from the Newspaper Association of America drives home the notion that conditions will only worsen for the newspaper industry. So, if you're hoping those shares of New York Times Company (NYT), Gannett (GCI) and Washington Post Company (WPO), holding your breath will leave you little more than dizzy.

Of the total advertising revenue generated in the third quarter of 2009, $5.8 million came from print, the lowest quarterly amount this year. The $623 million in online advertising sold by America's newspapers was also 2009's worst. Both are down substantially from the same quarter in 2008, when the newspapers posted print ad revenue of $8.2 million and online ad revenue of $750 million, according to NAA data. At this time last year, we lamented year-over-year declines approaching 20%. Now, we have the same feelings as ad revenue drops approach 30%.

Michael Moe knows how to make headlines: Talk about Twitter and predictably people will bite (I'm proof of that). He led the team at NeXt Up Research that calculated the value of the micro blogging service and arrived at $526 million to $674 million -- half what Twitter is generally believed to be worth.

Really?

The team estimates that Twitter will generate revenues of $114 million to $134 million in 2013. In 2014, Twitter is expected to post revenues of $126 million to $148 million. This is far more conservative than the valuation implied by the company's most recent round of venture capital investment, which puts the company's worth at more than $1 billion.

The Twitter ecosystem may be changing constantly, but most of that comes on the back of individual developers and outside companies. They beat on Twitter APIs to create new products that may win them glory, recognition or cash. Over the past month, though, Twitter itself has gotten into the game, releasing or announcing a handful of new features.

A new function for "retweeting" (echoing another's tweet to your own followers), changes to how trending topics are managed, and the ability to create lists are new tools intended to engage users ... on the Twitter.com website. Considered within the context of Twitter's changed terms of service this year, the upgrades may be part of a broader ad-based revenue plan.