[morganb]

Thanks for pointing this out in my post. What I was trying to suggest is that if I'm already spending 5.5 hours per month on Facebook looking at photos, commenting, liking things, etc. Why, once the functionality was available within the interface and on my mobile device, would I jump out of my default environment to use a series of other tools that don't integrate at all w/my preferred online service.

I was a bit rushed in the composition of this post as I wrote it on the train; but you are correct. Technically those things are in one place, just not the place a large majority of Internet users are choosing to spend their time online.