I wouldn't trust anybody on neo if they say the guild exploit has been patched, I seriously doubt it has.
I'm not sure whatsup with people mass spamming accounts though, haven't heard anything about that. I'm sure it could be somebody just mailing the active people who post on the boards for the hell of it. Haven't heard of any lookup exploits, but it's definitely a possibility. I wouldn't be too concerned though. Just be safe about things. Where did the 7000 number come from?!