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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.
…
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 …
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 …
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 …
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: …