I put zero stock in anything on social media. Like you I only have "real" friends- people I've spoken with or know in real life. I dont care if anyone says anything about what I post or forgets my birthday or whatever. My real friends no better than trying to actually connect with me via facebook. I do not argue on it, never get into politics or debates. I frequently do purges. I go through my friends list and determine if there has been any interaction and if they bring joy to me. If the answer is no I delete them. I think as long as you can put it into perspective like that, social media is ok. But if you need anymore meaning than that in your life, personally I would delete it because its all about what is good for your mental health in the end.