At the moment Retrospring has 2208 users but I see less than 50 active users. Why do you think so many users decided to stop using the site?
I like to think they're just sending questions to themselves in a self contained private friend group hovering just outside the public feed. I remember there being role playing accounts like that on formspring and you could sometimes find them if one of the members posted something to a public question and exposed their circle.
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