Today Twitter announced on their blog an upcoming change to their Terms of Service. The change in their service will not allow anyone to promote paid tweets through the Twitter API.
aside from Promoted Tweets, we will not allow any third party to inject paid tweets into a timeline on any service that leverages the Twitter API.
Twitter had announced previously that they will be releasing a “Promoted Tweets” platform for advertisers that will be non- intrusive and will always be relevant to the Twitter timeline. This action taken by Twitter could be a hard hit for small publishers that relied on the paid tweets that will be blocked shortly. Depending on how expensive the Twitter Promoted Tweets will be this will show us whether or not Promoted Tweets will be good for the little guy or not. I have contacted Twitter for comment.