There were two different kinds of social networks one could build—the Facebook kind, where people become mutual friends with each other, or the Twitter kind, where people follow others they don’t necessarily know. They thought the latter would be more fun for photos, because then people could follow based on interests, not just friendship. Displaying “Followers” and “Following” at the top of the app, the way Twitter did, made it just competitive enough that people would need to come back to the app and check their progress. People could also “like” something, appending a heart, similar to
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