I host a OSQA website on AWS EC2. Recently, I keep getting a lot of spammers (7000+) signing up and posting stupid poker-related questions. Here is a screenshot.

My questions are:
how did they do that?
how can I stop/prevent those spammers?
I host a OSQA website on AWS EC2. Recently, I keep getting a lot of spammers (7000+) signing up and posting stupid poker-related questions. Here is a screenshot.

My questions are:
how did they do that?
how can I stop/prevent those spammers?
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