I tend to use them only when I am bored. In texting, its the same way, but I'd say I use them way more online then texting. Its very rare in my texting.
The question I am asking is are you a Facebook playa or maybe the type that likes to walk and text. See the "new" trend is to walk and read a physical book. For me I login to fb once a month on a good year, or once every 3-8 months. Texting and walking I dont do, I force myself to stay in one place.