Twitter has announced plans to start showing adverts based on users' browsing information.
The social networking site said it will be "experimenting with a way to make adverts on Twitter more useful" to users by displaying promoted content from brands and businesses a user has shown interest in.
According to a post on its blog, the company - which allows people to send public messages of up to 140 characters - said: "Users won't see more ads on Twitter, but they may see better ones."
It said the move - which technology experts say will bring Twitter in line with other social networking sites that tailor adverts - will be trialled in the US "soon".
A spokesman said: "The ad pilot is US-only and we don't have a timescale for roll-out more widely."
Twitter will tailor adverts to the individual user's browsing information - although their personal email addresses will be unreadable, Twitter said.
It also confirmed it will not receive browser-related information from its ad partners for tailoring adverts if users have DNT (Do Not Track) technology enabled.
Twitter said if users involved in the pilot do not want tailored ads then they will be able to uncheck the box next to "promoted content" in their account settings.