facebook scripts in a couple of plugins

Working with social marketing plugin says:
"My site already uses javascript from this service: facebook, twitter..."

and also says:

"select yes in your pages already include scripts from facebook"

What does it means??

If i have appoinment+ and choose facebook to login my users for getting an appoinment.

So that´s the case?? if a have fabebook in app+ i have to check "yes" in social marketing in facebook??