At some point you need to recognize that there's an immense value in social media networking when you need to do adult things. 

To give you one example, social media has linked me with all my military contacts and has given me opportunities for career enhancing schools (talking to a guy about an AASLT slot or something, for example.) Then if you need help or advice or assistance in the future you have your guys all close to you. I don't think it's poisonous. Just don't be a dumbass, as with most things in life.