When a social app is working, it's often clear in the data: how many people are using the app on a daily, weekly, or monthly basis and how is the network growth trending over time? But evaluating the success - or, in our case, the potential - of a social app is not as straightforward as it seems. What does "good" look like, anyway? How do various categories of social apps stack up in terms of engagement, stickiness, and retention (and which KPIs are most important to track)? Can upstarts compete with the reigning social giants?

To answer these pressing questions, we took a deep dive into the top social apps across a dozen categories, in partnership with the app intelligence software company Apptopia.

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