Twitter is struggling to attract new users, so it's looking to other social networking apps for ideas. As Recode reports, the company is testing a new sticker feature similar to Facebook, allowing users to spruce up their photos with colorful, customizable additions. One such tester, @XBLFoxes, shared a screenshot with the new sticker option in the right-hand corner of Twitter's photo editor. The idea being, of course, that it could encourage people to tweet more photos and, in response, receive more likes, retweets and replies from other users. All of which would help Twitter to grow.