iBooks doesn't have a social profile, but it does have syncing of bookmarks, notes, and progress to other iOS devices. Not accessible from the Web or your Mac (since there's no iBooks for Mac), though... anyway, I definitely agree with you about iBooks' shortcomings.
Yeah, I know it cross-syncs, but the back-ups process is a real pain, and if people lose the back-up, they risk losing everything. It also bothers me ever so slightly that I can't read the iBooks in iTunes.
