The Wikipedia guidelines for external linking are at

http://en.wikipedia.org/wiki/Wikipedia:EL

Under "Links normally to be avoided" it includes "10. Links to social networking sites (such as MySpace or Fan sites), discussion forums/groups (such as Yahoo! Groups), USENET newsgroups or e-mail lists".

I believe this is the reason it is being removed.

It was removed by user "Bridies", who quoted "(forums/fansites)" in their notes.

KP