#2: To keep up with trends, to become aware of changes in industry related laws and practices, etc.
#3: To seek advice when I'm stuck on something.
#4: To avoid work guilt free! There are times when I know that I should do work either online or chores that need done offline but I just don't want to. I reluctantly log on and browse to Sponsorchat. I can waste time here under the pretense that it's work related without actually working.
Right now reason #4 applies....