The stuff with the forum threads happens all the time, I guess this time around there was a backlog of threads to be moved... Maybe a mod can help clarify that?

The eBay sign-in etc debacle yesterday was also not the first time that exact issue has affected the site. Twice in recent memory - usually on a Friday when the normal scheduled maintenence takes place - I have attempted to sign into My eBay only to be told my account / user ID doesn't exist, there's even probably an old thread of mine about it somewhere if it survived the changeover to Lithium. 

I don't think eBay gets hacked every Friday and their site maintenence is a ruse to cover it up, and these sorts of glitches have long since gone hand in hand with site maintenence, so if it helps any, I don't think there's great cause for concern or panic just yet.