Twitter has taken further action to encourage advertisers to use it.
It will allow marketers to chose from 350 different types of interest to help target the most relevant audience.
Users will then be selected based on who they follow, the contents of their previous messages and other behaviour on the social network. Facebook uses a similar system.
The company said it would be a more powerful method than just knowing the users' age or martial status.
It is the latest development in Twitter's profit-making strategy - it started charging firms to post messages identified by a "promoted by..." tag on its network two years ago.
"By targeting people's topical interests, you will be able to connect with a greater number of users and deliver tailored messages to people who are more likely to engage with your Tweets," wrote Kevin Weil, Twitter's director of product management, in a post on the site's advertising blog