Recently a page on Twitter was removed when someone posted as Exxon Mobile and chose to act as a voice for the company. At this time I do not know whether it was taken down by the individual or if Twitter removed the page at the request of Exxon Mobile. This article makes an important point about including a page on your main website or recruitment site that offers a listing or a official stance towards the social networking/media sites. This would allow all viewers to know exactly where the offical pages are and what are potentially misleading entries.
I believe the Twitter page was still up on Wednesday but it came down on Thursday. Check out the article; it makes some very important points that should be taken into account.