If you see a lot of purple on Facebook tomorrow, don't worry, it's not because Facebook got hacked by Barneynonymous. Instead, Facebook and sites like Yahoo and Tumblr are turning purple tomorrow to take a stand against bullying.
As part of Spirit Day, Facebook announced that it will support LGBT youth and stand against bullying by turning select national pages purple, including including Facebook's StopBullyingSpeakUp, Diversity and Safety pages. Basically, those pages and other Facebook users will turn their profile picture purple by adding a purple twibbon to their pictures. The purple hue of the pictures will be unmistakable. You can even do it yourself right here.