People hide behind the anonymity they believe the internet gives them to post whatever they want, especially if it's vulgar or threatening.  It's quite cowardly and base and has lowered the level of civility we used to have in this country.  When someone speaks up with their own face and identity they are less likely to post the hateful, vulgar rantings we find in most comments sections after news articles, and in venues like Twitter.  People should know that anything posted on the internet, including Twitter, isn't necessarily anonymous.  You are what you tweet.