I'll chime in
@JamieS since nobody else has offered a reply to your most recent questions.
I'm a vendor and not a dealer, but I can definitely speak to the "social savvy reps" question since that's almost exclusively who we deal with. When sales reps sign up with us they do so because they want to be more proactive in generating their own leads (great for the dealership, right?). They're generally ahead of the curve and "just get it". There are some that come to us and want their personal Facebook page tied to their salesperson website (which we
can do if they insist), but the majority either have a fan page or create one shortly after signing up with us. These are typically more professional than personal pages where their friends may be posting offensive things on their page or a variety of other potential things that may not be a good idea to have facing the public eye. There are also other advantages to having a fan page instead of using their personal pages in terms of features. In my experience, there are reps that try to leverage personal pages in a good way, but usually this is only when they don't know best practices...that's where it's up to my reps to educate them for success.
Regarding the knuckleheads who use the company name in their FB page name, this can be a good thing when done properly but it's definitely a concern. This is also why we suggest that when clients sign up with us that they choose a domain name which does NOT include the dealership name. Something like
www.TrueCarSalesman.com instead of NickAtLouSobh.com. There are benefits to both the dealer and the rep so it makes sense. From the dealer's standpoint, their name isn't being used where they have little control over it (as you've experienced already). From the salesperson's standpoint, they're not locking themselves in to that store when it comes to their own marketing efforts. In other words, if they leave for another store in the future, they don't need to start from scratch with a new domain that makes more sense.
Lastly, the only tip I can offer for your ex-employee that started a FB page is to report the page to FB as 'permanently closed'. Sometimes this works and sometimes it doesn't, but if you haven't already done that, I would start there.