Twitter has finally crossed the rubicon and will allow advertisers to target ads to you based on the words that you tweet. specifically, the feature is called ‘keyword targeting in timelines‘, and its available today in 15 languages and all markets.

Twitter previously used the content of tweets to fill out its interest graph for advertisers, but this update brings laser targeting based on the topics that you tweet about to the product. Twitter uses the example of a person who tweets about enjoying an album from a band. A local venue could use a combination of Twitter’s location-based targets along with a keyword tuned to that band to pop an ad with a link to buy tickets to that band into the user’s timeline as a Promoted Tweet.

Twitter stresses that they’re not showing more ads in anyone’s timeline, they’re just going to be showing better targeted ones. And users will still be able to voice their disinterest by dismissing un-relevant Promoted Tweets. The ad targeting is also “based on the keywords in their recent Tweets and the Tweets with which users recently engaged.” That engagement could come in the form of retweets, favorites and other actions.

Twitter says that tests run with companies like Microsoft and Walgreens, they saw a jump in interactions with ads based on keyword targeting vs. other kinds of targeting.

Here’s what the new panel will look like for advertisers: