Jumping Jehosaphat
Celebrities have too much other stuff to do. They don't live in the same boredom bubble that most of the rest of us do.
You'd be surprised.
wink
Celebrities have free time too, and there's a lot more time waiting around (between takes when filming, while on tour, while travelling, waiting at airports etc.) than many people might believe. With so many mobile internet devices and hotspots with WiFi around now, faffing around online is a great way to kill time.
I don't know about here on Gaia specifically, but I do know at least 2 fairly famous musicians and several of the well-known TV actors I've worked with have active anonymous accounts on other sites, such as Reddit and Something Awful.