Facebook is kind of a like a big room with a bunch of theatrical stages, and each person has their own stage.  The things people post are kind of like them standing on their stage and announcing it to the rest of the room.  It's loud and on a stage, but not everyone notices because they're all on their own stages and there's a bunch of background noise.  Every now and then, someone announces something from their stage and it gets echoed around to other stages. 

Blogging is kind of like talking quietly to yourself while walking down a crowded street.  Most people don't even notice you're there, but every once in a while you'll get a passerby looking for information.  And shouting obscenities in your face. #technology