I don't have any particular love for Facebook, but it remains the best way to share my underwater photography with friends. That's a positive reason. I appreciate how they give me a convenient distribution platform and it's all free.
Why could you not post all of your pics to a shared photo album that’s shared with your friends? It’d even remove the step of posting it only because as soon as it’s on your machine it’s uploaded to your cloud photo album. And it’s still free. Further what if you want to share this with those that aren’t your friends? You’ve required facebook usage with no real gain.