Not using social media is like never using a knife. Both are dangerous, but when used properly and with care can be exceptionally useful.
Are there times I'm careless with social media? I suppose there are certainly times I could be more reserved. But the more you [properly] manage your social media accounts the more you can gain from them. While you do open yourself up to a certain degree of transparency, you also offer an opportunity for people who offer you something beneficial to find you (ex: old friends displaced by time and distance, other hobbiests who share your passion).
If you don't own and never use a knife or other sharp-edged tool, you'll never have to worry about cutting yourself while using one. You'll also find that there are many tasks which are far more difficult to accomplish without one. And despite what you read in the news, you're pretty unlikely to kill, or even severely injure, yourself if used properly.