Colleges & Workplaces snooping through people's Social Media posts

Recently, a young student hoping to attend Bowdoin College in Brunswick, Maine, was unfortunately rejected due to the fact that she had made explicit comments about the the attendees present with her during a campus information session, after the admissions office had caught mention of this, they had read every single tweet and had decided to not let her into the college, because of the comments made about attendees. This makes me worried about my personal digital footprint, as some things that I have posted online are not exactly appropriate or approved by everybody in the whole world. For me, that's acceptable. I don't expect to be the most considerate person in the whole world, and I know I can't make everybody happy, but I certainly enjoy posting things on the internet and browsing it, and I hope colleges respect that in a way that I can still keep my school and internet lives separate.