I too found Facebook addictive for a while, but once I came to the same conclusion as yourself (that it's a waste of time), my mind seems to have conditioned itself to abhor the entire Facebook experience. The fact that the app is rather buggy helped rid me of my addiction even quicker. Now I occasionally use Facebook as a research tool before or after I meet someone - it's great for the occasional snoop, but I no longer class it as fun, entertaining or even addictive tbh.