So, tried to post an ad for my site here, and got the message "guests can't post external links or emails". Since this basically means people have to sign up to post a legitimate ad, it's not really guest-friendly, and is likely the reason admins of other sites would delete your ad, since they cannot link back.
I believe you can change this by going to admin >> general >> forum >> security
I'm not trying to step on toes or anything, just wanted to let the admins know about this, so that they could possibly increase their advertising potential. Thanks! c: