Twitter to push ad products to 50 countries by year’s end

Twitter brought in an estimated $139.5 million in ad revenue in 2011, and it’s found a business model that’s made for mobile; now it’s greatest obstacle in ramping up revenue is the limited availability of its Promoted Products, which are currently available in the U.S., UK, Japan, and Canada.

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Twitter ads now unavoidable in iPhone, Android apps

The Twitter mobile experience is getting infinitely noisier today. The information network is in the process of pumping up the volume on the amount of mobile advertising content it shows to users.

Twitter’s ad model takes shape with Promoted Accounts

Twitter revealed the latest piece of its advertising strategy today with a new feature called Promoted Accounts, where companies can try to attract more followers to their Twitter accounts by paying the microblogging startup for prominent placement.