Twitter confirms it will begin in stream advertising

Twitter said it will begin testing the new advertising offering with a number of companies including Dell, Gatorade, Groupon, JetBlue, LivingSocial, Microsoft, Red Bull, Starbucks and Virgin America.

Promoted Tweets from non-profits such as the Make-A-Wish Foundation and the American Red Cross will also be shown, the San Francisco-based Twitter said in a blog post.

"When we decide to follow a favorite brand, business or charitable organization, we expect to be among the first to get a special announcement, access to exclusive content or a great offer," Twitter said.

"That's why starting today, we're introducing a way to ensure that the most important tweets from the organizations you follow reach you directly," it said.

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