If you're unsure about what it's about, here's a simple explanation...

Twitter - I'm eating a #donut

Facebook - I like donuts

Foursquare - This is where I eat donuts

Instagram - Here's a vintage photo of my donut

Youtube - Watch me eat a donut

Linked In - My skills include donut eating

Pinterest - Here's a donut recipe

Pandora - I'm listening to 'Donuts' by Dirtcaps

Google+ - I'm a Google employee who likes donuts