Twitter revealed that it won't allow third-party companies to provide ads in user feeds. The San Francisco-based microblogging network also added that industries that earn revenue from Twitter content may have to reimburse the company. A lot of companies have experimented with advertising on Twitter and this move is definitely going to affect them. 140Proof serves in-stream ads in several Twitter clients.

They always say, "We are in active discussions with Twitter (about these and other matters), and have been for several weeks. Once that process concludes, we will have an exciting announcement to make".

TweetUp revealed that it never tampered with timelines, so it will not infringe the new terms of service. It nicknamed itself the "AdSense" of Twitter and debuted new widgets in New York today. TweetUp allows people to pay to bid up specific tweets so they remain on the top of TweetUp's search results, rather than trying to auto-rate tweets on the basis of content or links.

TweetUp's Chief operating officer Jon Kraft said, "It's hard to predict what they're going to do, but the vast, vast majority of our plans really, are not going to be affected by the terms of service changes".

Ted Murphy Chief Executive of Izea, which runs Sponsored Tweets revealed that Twitter doesn't seek to control what a user tweets.