You can add me to the list of people who want nothing whatsoever to do with Facebook. Never had a Facebook account, never will, don't want to go near it.
Moving on: the big problem with the web-based profiles, for me, is that the in-game web browser simply DOES NOT WORK, at least with any measure of reliability. I haven't been able to open a single profile on it today, for example; I just get a black box filling two-thirds of my screen and doing nothing.
I'm also rather used to reading profiles in-world "at a glance", and this is simply not possible any more; once I've opened a profile page in my external browser, I still have to click through for things like group memberships (seeing the first three in alphabetical order is NOT helpful!) which I used to be able just to look at in one move.
So - besides the issues of privacy and personal choice involved in the whole Facebook issue - the technology isn't reliable, and it's a major step backwards in terms of ease of use. Consider me unimpressed.