Usually, people populate their Facebook and Twitter feeds with hand-picked social connections. Friends, co-workers and celebrities’ updates fill our timelines and profiles. Social media channels are filtered to contain people, brands and subjects that we have an active interest in. In a sense, we see what we want to see; it’s a filtered version of the real world. But a new app from MIT’s Playful Systems department aims to change that.  20 Day Stranger gives people the opportunity to intimately share in the life of a stranger for 20 days via regular social media-esque updates in anonymous context that shatters conventional filter bubbles.