• Media Memo, Monday, May 24, 2010 1:15 PM

Twitter has up and decided to block any and all third-party ad networks from running ads on its service. "We will not allow any third party to inject paid tweets into a timeline on any service that leverages the Twitter API," the company clearly explained in a blog post. For its part, Media Memo said it "sort of" saw this coming.

"When Twitter launched its own ad system last month, COO Dick Costolo made it clear that Twitter would be restricting the way that rival ad systems could use the service's data feed." It appeared to some at the time -- including Media Memo -- that Twitter wasn't shutting the door entirely on select ad networks like 140 Proof and Ad.ly. It has. Media Memo also suggests that Twitter's decision to block third-party ad providers could negatively affect the developers, too, and will likely clear the way for Twitter rivals to spread their wings.

Read the whole story at Media Memo »