Other then its easy attention seeking.
None of you are interesting enough to justify it.
English
#Offtopic
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It's popular because of Reddit and because people like to blog about their lives. AMA threads allow people to disguise blog shitposts as discussion threads. It doesn't help that any girl who makes an AMA thread here will get 300+ replies from lonely guys who want to get attention from females. Once those threads happen, other attention hungry users think it will work for them too and thus dozens more AMA threads are born.