Is a publicly professed porn habit a warning sign in a new relationship?

Its a little out there. Could also be he has such a low sex drive that it isnt clicking in his mind the effects this can have on his image, if that makes sense.
In any case, she just started dating him and he openly does this.. its something to pay attention to at the very least

He's 58, divorced with grand-kids.

Maybe he's letting people know he is interested in the subject matter on that porn site. (women, couples, kids, gay, bi, etc)

Best to ask HIM what it all means.

Given the millions of followers/friends many porn stars have, it doesn't seem out there at all.

Should your friend be concerned? only if she can't talk to her new boyfriend about it. If he's an adult, hopefully she is one as well.

What seems weirder to me is that she's asking a friend about it, instead of her new boyfriend (and that she's inspecting his FB page that closely).

Holy crap it's just sex man...