I had this problem for a while, PeopleBrowsr support told me to make
sure I was logged out of facebook... If you're already logged-in on
the same computer the connection seems to have trouble. I would
suggest logging out of facebook manually, and deselecting "remember
me" (you can always reselect "remember me" after the PB to FB
connection is set).
You'll have to take two steps, After you allow facebook to send to
peoplebrowsr, you'll may to manually log out of facebook again (that's
why deselecting "remember me" is important) before doing the second
step, which is allowing allowing peoplebrowsr to send to facebook.
As an aside, facebook is in the process of changing the way 3rd party
apps connect to facebook, and facebok went down for a while last night
(4/23/10) so there may be connection issues related to that...
Hope one of those helps :)