Sometimes I feel like I have a "genetic advantage" to not be attracted by social media. I have a Twitter account that I rarely use (mostly for API-access for NLP research), I check into my Facebook account maybe once a month and have never used Instagram. I watch some things on Youtube (usually recorded lectures or tech talks or board game videos) but rarely ever "drift" towards recommended videos and the like.
I used to be on IRC a lot back in the day but quit it completely, I used to frequent specialized forums, especially when I was an online poker player but also have quit those completely.
Don't have a Reddit account and am not really following that. I guess my HN account is the most used social media right now.
I also don't feel the urge to post and share pictures which I notice a lot in my friends. Sometimes it feels like a moment doesn't exist for them unless they can capture it in a picture (whereas for me it actually disturbs the enjoyment of the moment to stop and take a picture).
I instant message but am notorious for "answering late" and keep getting complaints that I don't check everything immediately. I usually put my phone on the charger when I get back to work and only look at it every now and then, sometimes not at all until I go to bed.
Interestingly, I am very interested in how social media works technologically and have also been an early adopter of many technologies. However I feel like I'm fairly "results oriented" when it comes to social media so I expect some sort of benefit from using them vs. the time spent.
I've also noticed that I'd probably test well on my ability to delay gratification and I feel like this might be correlated with social media consumption in some way (maybe there's studies on this?).