I hate to break the news to skeptics of social media reading this but if you are participating on Roadfood.com you are using social media
I've been doing this for 28 years now from the day when I had to hand type in a Basic BBS program to get online dial-up to an independent bulletin board system. I was on many of the early dial-up national systems like Compuserve, GEnie, Prodigy, Applelink and AOL. I was on so much so that AOL (at the time Quantum Computing) and Apple contacted me to be on the startup team for Applelink Personal Edition which morphed into AOL.
I joined Facebook when it opened to the public. Like Paul said, you control what you post
. It is very evident a lot of people do not have self-control and understand it is public and post a lot of embarrassing stuff.
The positive of course is extending your acquaintances and even some true friendships beyond where you physically live. I have extended friendships around the country with people on many levels now be it road food, RVing, my profession of architecture, etc.