I believe the term used is a “professional”.
Grigsby Law Group,
I’ve noticed an increase in the usage of LinkedIn by people I know. Is there a term for a LinkedIn user? Is there a term for a Facebook user? I think “Facebooker” sounds okay. Not sure about LinkedIn-er.
Anyway, Business Insider has a handy guide to thirteen things you can do on LinkedIn.
Now go impress each other with your profiles!