It's 2015, and your friends are sharing that block of pseudo-legal gibberish that supposedly prevents Facebook from using their "copyrighted content." This copyright notice means exactly the same thing it did when they posted it in 2012, 2013, and 2014: jack shit.
Don't copy it. Don't paste it. Do read Facebook's Terms of Service, which lay out exactly what you've already agreed to let them do with your photos, wall posts, and other precious social media treasure.

