I'd like to add/amend something GK said- DON'T shitcan your social media stuffs. That's a warning sign to them. DO go through and set your privacy settings, remove anything that might be considered offensive, and do make sure there are no questionable pictures. Rest assured that deleting your social media does not get rid of it. Once it's out there, it's out there.

If you have no social media stuff, now is the time to get LinkedIn going, and possibly a nice, innocuous Facebook page.