Nearly since it’s inception Twitter has been attempting to find new ways to generate revenue and now thanks to their “Promoted” products a new study suggests that the company’s revenues will grow from $45 million in 2010 to nearly $400 million by 2013.

According to tracking firm eMarketer Twitter in 2011 is on pace to earn $139.5 million, a 210% incrase over last years numbers.

According to Debra Aho Williamson, principal analyst at eMarketer:

“Since their debut in April 2010, Twitter’s Promoted Products have proven successful in the U.S.,” while she adds “Marketers have shown solid engagement rates with Twitter advertising — in some cases better than those on Facebook — despite Twitter’s relatively smaller audience.”

With a user base that currently sits at 100 million active users the estimated revenue stream growth from Twitter could increase over the $400 million estimate if Twitter finds new ways to engage users and grow their base. In comparison Facebook current serves more than 800 million users worldwide. read more