I went on the same whim, but as to more showcase the work in another way than my website would do. It's now more a sort of blog for me that an actual way to find work... alas a blog I'm too busy/lazy to maintain.
I'm not entirely sure that professionals would use FB for that kind of finding a photographer for a job.
The last few jobs I had I picked up via google > my website, so I guess that's still the main road for people to go when in need of a photographer.
And ofcourse, then there's the whole "we'd like to own everything you add to FB" attitude of FB 🙂
leGrevé Photography on Facebook, although I think it's more interesting to look at my website instead hehe.