I'm not there yet, but to me I wouldn't care about my FB page driving people to my website necessarily. I like the idea that clients/friends/family can share my work for at no cost to me.
While they are nice, It's not about immediate inquiries and/or bookings for me... I'd like the brand recognition. Say you shoot seniors and/or weddings. If you can post one or a few pictures from each shoot, or the best ones from a day or weekend that client(s) will share with all of their friends. How many people see those images, and also see your brand/watermark? Maybe they aren't looking for a session right away, but if they remember me 6 or 12 months from now, when they are ready... that's still good enough for me. It really only takes a few minutes for me to upload a few pictures from a session, so as long as it's generating interest and it's getting shared... at no cost... I'm good with it.