Some people are so afraid of damaging social media mistakes that they avoid the whole scene altogether. But that can be costly too, as social networks have become prime recruiting territory. Therefore, skirting potential issues via non-involvement removes you from too many opportunities to make that a smart option for most.
At the very least, maintain an updated business profile on LinkedIn. It's the first place many employers go to check you out, and if you don't have a LinkedIn profile it likely sends the message that you're not current. If you’re in a creative or sales-oriented field, use personality to your advantage with at least selective involvement on Twitter, Facebook, Pinterest, Instagram or Google+.