System is not flawed. FCN live chat is a high web traffic destination and as a result it attracts a lot of scammers, spammers and other sort of trash.
Use more of your own communication rather than URL Spam. Use uploads rather than linking to images on some sketchy website designed to lure traffic simply by hosting images for mature audiences.
Some URL destinations contain spam and malicious content, which will trigger the system for obvious reasons.
The intent is to protect people from malicious content. If you log in to just post URL's, that's literally spam, not social activity.