Nothing, unless Yelp counts as social media but I think it's halfway between that and a review board (and I refuse the app, too many permission requirements).
I toyed with the idea of a couple of fictitious Instagram accounts for circulating my own rants & memes but since FB runs it I don't think I will, at least not until I can afford a disposable 3rd phone or tablet to on a prepaid service not connected to me.
In addition to no social media, I don't run any live apps, I don't even have mobile data, and I do not install apps that require permission to contacts, images or memory card.
I also do not pay with debit or credit - I refuse to participate in the outrageous fees they charge to merchants - I believe the consumer and merchants should both be getting 2% COMMISSION when they use electronic payment as a reward for all the valuable data it generates and never paying any fees whatsoever except penalties for missed payments and such.