Last fall, FiftyThree introduced Mix, a new way for users to collaborate on sketches and ideas in Paper. Though it’s only been a few months since launch, the Mix feature set has grown by leaps and bounds. One of the most requested features was the ability to search for friends. Unsurprisingly, Mix users wanted to find and collaborate with people they already followed on Tumblr, Twitter and Facebook. Just before the new year we launched creator search in Paper and on Mix.