[L0in]

You don't.

Either you hire someone to manage your Social Media or decide specific rules of usage. Login only at work hours, for such amount of time to do X and nothing else. Try to have a blank account, empty of anything outside of work related, for example blank Facebook account which hosts the business page/group/whatever.

[b20000]

i guess i can have a blank account and join groups. i am wondering if there is an unfriend all button somewhere.

[L0in]

There isn't. When i wanted to turn my facebook account blank i used a script.