Lately, there has been a lot in the press about adult type classified ad postings. This type of advertising is usually acceptable as long as it is within the TOS, legal and not used for predatory purposes. In theory, that sounds obvious and logical. However, the truth of the matter is there are scum-bags/psychos (criminals) in the general population who will exploit the classifieds for illicit and predatory purposes. 

So I strongly recommend that if you plan on meeting someone via the classifieds, you should bring a friend and always meet in a public setting. After all, you do not know this someone. Be alert!