Should I delete possibly bad social media profiles when I apply to uni?

Universities won't care, nor will they have time to look at your social media activity. Employers will probably look at your facebook, but they won't bother to look at posts from the past six years, all of your likes etc, I worked in the office of an agency, and boss would just have a quick look at facebook profiles to get an idea of the person.

What about if someone says they don't have a facebook account, do alarm bells ring? (I genuinely have never had one).

What about if someone says they don't have a facebook account, do alarm bells ring? (I genuinely have never had one).

What about if someone says they don't have a facebook account, do alarm bells ring? (I genuinely have never had one).