Web ads will now follow you to Twitter It is thought the use of cookies is part of Twitter's plan to become an advertising powerhouse after the $23.8 billion valuation proposed by its $43.69 share price. Zach Coelius, CEO of retargeted ads company Triggit, said Twitter's method will give the company a "huge advantage." He told Tech Crunch: "Twitter is in a unique position because people log in both on the web and phone. That's a really big deal because mobile phones don't have the ability to set cookies so you can't do retargeting. [Twitter's method] gives it a huge advantage, enabling them to provide relevant targeted ads on mobile phones. Twitter currently offers an opt-out of retargeting under "Promoted Content" on its "Security and Privacy" settings page. In July, Twitter introduced targeted adverts in the US to show users interest-specific content from brands. The sponsored tweets are determined by online user data, such as frequently visited websites and subscribed email lists.