FE will delete / lock / edit threads as they see fit. I don't think its open for public debate. If you really want to know hit the Contact Moderator button at the bottom of the thread above the Add new response bit... and ask NICELY!
I think it was deleted/blocked because it contained a lot of personal details about forum members (not that that really matters as they of course posted these themselves!). I also believe that it was more of a "chat-room" type thread.
A number of others around the same time in a smilar vein were also delted/blocked.