I think that when I wrote a comment on a friends album (they must have uploaded it to Roam7 from a facebook album), that the comment I wrote (via Roam7) then appeared on their facebook account.

I think ultimately it would affect how much I post on Roam7 - if I know that things are publicly accessible, I would edit/sort through my photos more and the time required for that probably would affect the amount of content that I post.