SAN FRANCISCO - Twitter is testing a new tool that asks users if they’d like to open articles and actually read them before retweeting to their followers.The feature is being tested on Android phones in English “to help promote informed discussion,” the company said Wednesday.“Sharing an article can spark conversation, so you may want to read it before you Tweet it,” Twitter Support wrote.When someone goes to retweet the link to an article on Twitter but hasn’t clicked through to the story, they may be shown a pop-up message asking if they would like to read it before retweeting.The goal is to slow the spread of viral misinformation, according to Twitter’s product lead Kayvon Beykpour.“It's easy for links/articles to go viral on Twitter..