Twitter’s advertising platform has been a controversial (and heavily scrutinized) source of revenue for the company, and it’s one that hasn’t yet delivered on the innovation we were promised by Twitter CEO Dick Costolo way back in 2009, leading to much egg on face.

Still, it’s a key part of the platform’s move towards profitability, and this nicely designed infographic from Mashable takes a look back at the history of advertising on Twitter, which begins with the very first tweet from founder Jack Dorsey.

Highlights include Kim Kardashian’s rumoured $10,000 per tweet promotional deal, the introduction of Promoted Tweets, Trends and Accounts, revenue estimations and, of course, Charlie Sheen.

(Hat tip: Mashable.)