<human>: * We've been together for roughly 14 months.
* This is about several of her guy friends. Objectively speaking, some clearly used to be/are interested in her (let's call them Group A). Others are just friends/unknown (these are Group B).
* They don't hang out with her at the same time (ala group of friends). 

I've gotten her to stop hanging out with guys from Group A, especially because it led to bad situations. 

So now my issue is just the guys from group B.

I don't want to bar her from meeting them entirely. I don't want to tell her to break off the friendship. I don't want to get into this anymore, but yes, I was justified and she agreed in hindsight after apologizing profusely.

I would like to deal with how uncomfortable I feel about how said guys (at different times) maintain constant communication with her on Facebook chat (because she usually shows me some things on her feed and the chat window with said friend/s are visible on the bar. I do not log into her account -- I don't even know her password.), via texts when we're out of the house. There have been times when the communication was virtually endless for the length of several days (Switch from text -> facebook -> text -> real life -> etc). They would also just constantly meet up and invite her to go watch movies/plays/go ice skating at the mall.

As I said, I don't want to toss a wall between them. But I would like the guys from Group B to back off.

Should I talk to them myself? If so, what do I tell them?

Should I ask her to talk to them? If so, should I do a follow-up to make sure she does so?

How do I go about this without offending her (I don't really care about offending them but if it's avoidable, that would be good. For most, we are friendly acquaintances. The rest I've only seen in passing.)?

Provide a brief overview of the text.
<bot>: I'm uncomfortable with guy friends constantly talking/hanging out with her. How do I deal with it without hurting anyone?