We've installed an add-on to help us keeping the spammers at bay.
(We're still getting more than 100 spammers trying to sign up each day).

The add-on comes with loads of options, which we may have to fine-tune in the next days.

One side-effect of the addon is that it limits the amount of URLs that are allowed in a post before that post is automatically sent for moderation. Any post containing more than 3 URLs will automatically be sent for moderation.
(We're looking into a way of creating a usergroup of trusted users for whom this would not apply. Please bear with us).

Do not hesitate to contact the staff if you would experience any problems because of the add-on.