Federal contractors are prohibited from using social media to evaluate candidates - so it takes it out of our equation. Non contractors can look at social media...
The safest approach is to always assume that employers absolutely will search applicant’s social media profiles. In many cases, a social search / review may even be included in the formal background check process.
The best advice that I can give to you have questions about your postings then I would suggest that you remove them or not post them. Follow your gut. Some employers do look at social media and it can influence hiring decisions.
There are privacy settings that could limit the publicity of your profile on various sites, but there isn't a guarantee that it will be 100% fool proof.
Google your own name and make sure your friends haven’t tagged you in embarrassing photos or blogs.
I always tell people, if you have things on your profile that you would not want your grandmother to see then take it’s probably not appropriate!
[H]ow you "show" on social media sites can also tip recruiters off on what kind of judgment or common sense you have.