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Re:Is Vine Instagram for Video? by kmfrk on Monday January 28, 2013 @01:42PM (#5129904)
It's popular the same way Quora is:

1. People like Techcrunch are talking about it.

2. (...)

3. Success!

Re:Is Vine Instagram for Video? by dmix on Monday January 28, 2013 @07:17PM (#5131605)
Step 1.5: Trendy SV/SF people starting tweeting and blogging about it.