Actually I dont think facebook is to blame here.
Back in late 2006 and 2007 bocking was new, EVERYONE was dead keen and desperately in search of fellow bockers and places to go bocking. These days there are more organised groups all over the country and there is generally less excitement about a new bocker etc.
flipping used to be a jedi only trick and really something to scream about. Now there are a lot more flippers and again this takes a knock on the excitement.
Forums like PJF still have their uses but this is just the natural course of things.