I think your digital footprint is something to keep in mind, but not stress too much over. Every one of us that has a Facebook account/a Twitter account/a MySpace account/an Instagram account has probably posted something somewhere that someone somewhere could be offended by.
Personally, I'd be more concerned about whoever your current employer is snooping through your social media. My previous employer had a lot of "rats" who would add you as a friend, then run to the CP and HR if you posted something disparaging about the company or any management people. You couldn't trust anyone.
I haven't deleted my FB page, but I'm very inactive on there now. It's a huge time suck and just not worth it. I'm sick of seeing everyone post their perfect life, their travels, their Brussels Sprouts they made, kids kids kids, and political opinions that no one asked for and don't change anyone's mind.