Problems with visitors

Please investigate this:
https://www.spoj.pl/forum/viewtopic.php?t=4456134

he did his first tests at around 3:41 AM, and now its almost 5 AM and hes still trying to spam...

i think its easy to investigate since he is using the same language, on the same problem, with accounts that have 0 AC submitions

The user feimotion33415 has been posting spam in the forums recently.

thanks, these posts have been removed.

He's back again.

And now sztin1043. Looks like upgrading the forum didn't get rid of the spammers, quite the opposite

Now user defg551 is posting spam in the forum. Btw, what's the reason that the users mentioned in the previous two posts are not banned till now?

This is getting exponentially worse..

I got an idea from this2 thread.Admins should introduce blacklisting.They can give blacklist rights to users who have atleast N posts.And when a post gets atleast X blacklists it is removed automatically.Is it possible to implement this ?

Posts by spamers mentioned before has been removed. Thank you for the hints.

A new spamer called "yj1tm2pl3" appears.

Thank you.

User lyjg0115 is spamming in forum "other programming languages".

thanks!

Another one. User cdef043 has posted many spams in the same forum.

thanks!

I think Mr.HASSAN01 is drunk or something. He has posted ads in the 'Problem Set Archive' and in the 'JAVA Based Languages' section.

I've deleted his (spam) posts. Thanks.

Well, another one named ARCLINKS has posted spam ads in C/C++, functional programming and off-topic sections.