I think I found someone spamming, but so far they haven't been detected
137732
What's the best way to report SPAM user accounts?
7959
Timestamp on question is later than Profile's Seen, must be some time traveller or ninja
35761
How to identify a downvoting stalker
141462
Should Stack Exchange have a spam filter? (Does it already and I’m not aware?)
121654
How to deal with spam user posting ad in their profile page
30409
Prevent malicious bots from posting spam
105947
What actually happens to someone whose account is hacked by a spammer or hostile?
23106
There is by now a captcha-problem
130593
Warn users that they might be committing vote fraud
140480
Timestamps for spam and offensive flags not shown
115638
Will Winterbash promote mass spamming due to its short time frame?
7798
How can I prevent my mail from being classified as spam?
125234
Contacting someone unannounced via chat
1673
How do you make sure email you send programmatically is not automatically marked as spam?
34245
Handling harassing users?
97434
^@ spam in tty (but seems to be system-wide)
58992
Can we report / do anything about a persistent troll?