Just to show that interesting things go on outside English Wikipedia:

http://meta.wikimedia.org/wiki/Requests_fo...ia_Sockpuppetry

I don't think they're socks. Serbian IP ranges are very small and it's quite possible that several users share IPs.

CheckUser also considers browser version strings and timings. If the 3 admins all used the same version of FireFox and all upgraded at the same time and were never on doing unrelated tasks simultaneously, that's a smoking gun as far as CU's are concerned.