I remember years back on Wikipedia, clever vandals would play Unicode tricks. It was interesting, to say the least - you'd register a name that looks identical to a real user, vandalize, and hope the administrator would type the name in...
Although it's not vandalism, something else that permeated Wikipedia is the use of the Cyrillic ya (Я) in places of R, where the stylized artwork for the article subject reverses the R (and varies it in many other ways, for sure).
The difference between the two is that this phenomenon is not wholly in the past.
One of the biggest thorns of the situation is when editors bring up an official or semi-offical website related to the subject and using Я, pointing to its existence as "proof". No, that isn't proof; whoever is managing that area of the web properties is just a jackass.
This was ultimately stopped by Antispoof (https://secure.wikimedia.org/wikipedia/mediawiki/wiki/Extens...) but the bug reports are still interesting:
- https://bugzilla.wikimedia.org/show_bug.cgi?id=2593
- https://bugzilla.wikimedia.org/show_bug.cgi?id=2290