Wikimedia Bugzilla is closed!

By the way, "overflow: scroll" doesn't cause such problems. Please fix this bug.

It's not a bug. The spam filter is working fine. The problem is that our wikis,
and a lot of other wikis, suffer from frequent spam which is injected into pages
in "invisible" divs, with a style approximately similar to:

<div style="overflow: auto; height: 1px;">{...}</div>

Where {...} represents a ton of URLs to various web sites. I believe that a
regex was hard coded into the configuration for all our wikis to prevent this
behaviour.

Well, what about tinyurl? This filter is not useful - the spamer can just
replacing the tiny address with the real one - and causes troubles.

TinyURL introduces a number of problems, many of which have been discussed
before. We're talking about a redirection service which you don't control; it
could be taken over or compromised at any time, and all those links could end up
pointing somewhere else. You also can't preview where the link goes; some
spammer could be slapping in links to a reincarnation of Goatse or a Last
Measure site.

If the spammer uses the real URL instead, then of course, that goes on the
blacklist too.