Swarm had an interesting and potentially successful idea with its location-based social network. The app allowed users to post ideas for what to do that day, such as going to a bar or just hanging out, which was cool and all but there was no way to filter certain people out. That meant that you’d basically be inviting everyone to hang out, including people you didn’t want. Fortunately the app addressed this issue in a new update and now allows for direct, private messaging.