While Facebook is a social phenomenon, there's plenty of concern about its privacy breaches and policies. Danny Sullivan, in his blog Daggle, also is concerned. He reports that more and more sites are offering him ways to log in using Facebook, which is OK if there isn't yet another registration form to fill out. But the permission pages that come up sometimes are so scary, he says, that he usually declines the offers. Could such intrusiveness hamper your marketing efforts initiated through Facebook?