In an effort to make our site as open as possible we have unintentionally made it too easy for spammers to harass our beloved members. The last thing we want to do is alienate our members, so we are working hard to keep the site as unencumbered as possible but really weed out spammers and outright lock down some of the features that were too easy to exploit. Features like sending custom messages with invites. We hope you'll still invite people, especially once we rid of our little infestation.
In the mean time feel free to flag spammy content and report anybody that bugs you. Thanks