Over the last couple of days we've been experiencing a rash of spam registrations. These haven't followed any clear pattern so have been difficult to stop automatically, so sorry for any dodgy or incongruous posts you may have seen!
We've put in place some additional protection which will hopefully slow them for now (we'll never stop them), and this morning have deleted about 100 newly registered accounts that were either spamming or clearly future spammers.
If you see spam and have the will please report it using the 'report to moderator' link alongside the post. We do check all new registrations but sometimes they slip through the net.
Thanks,
Dan