I am on Faceache very regularly. However, I rarely post anything and I'm a member of only a few fishing related groups. I generally find those I've looked at quite painful. I find that they offer little that forums don't. In many ways they are inferior. I can certainly find better quality information, more easily, on forums than I can on Faceache. The only potential improvement is the huge potential readership. Far and away greater than any forum I know of. Great if you've got something to flog. There are certainly plenty of entities trying to part you from your cash. However, I firmly believe that forums are generally inhabited by a greater percentage of real enthusiasts. Therefore, the quality of response, provided you get one, is greater. I'd sooner have one quality response on a forum than a hundred rubbish ones on Facebook.
I'm sure Facebook will provide many with all that they require. It certainly doesn't suit me though.