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Questions about captchas and other spam detection measures on SE.

16 votes
Accepted

How to deal with persistent Spam-Users

The goal of these spammers is to spam their URL everywhere. So we can use that against them; it is their weakness. Just make sure you report the URL back to us, and we will add it to the blacklist. …
Jeff Atwood's user avatar
15 votes

How do I deal with spam users?

That's absolutely correct -- please flag this spam users for mod attention and indicate "possible spam user" in the comment to the moderator. We have zero spam tolerance, and trust me, our destroy to …
Jeff Atwood's user avatar
2 votes

Are there specific topics on Stack Overflow that attract more spammers than others?

We have protection for this: https://blog.stackoverflow.com/2010/06/new-protected-question-status/ I have been considering some heuristics for auto-protection, such as "after 3 deleted answers by mode …
Jeff Atwood's user avatar
7 votes
Accepted

Hide website field in profiles of users with less than 15 rep from users not logged in to co...

This is a peculiar request, because as I already answered, none of the links on very new user profile pages are actually hyperlinked. Note that Links in your "about me" field don't work for low-rep …
Jeff Atwood's user avatar
3 votes

Why show captcha when an answer takes too long

To trigger CAPTCHA: The minimum window is 5 seconds The maximum window is 40 minutes basically we are flagging anything that looks suspicious, and forcing users to prove they're not bots. edit: …
Jeff Atwood's user avatar