the­re are style­sheet links in face­book’s in­stant ar­tic­le ex­am­p­le ar­tic­les:

the pu­blishers abo­ve pro­ba­b­ly use style­sheets of their own. i tried put­ting some font de­fi­ni­ti­ons in a style­sheet and ad­ded it to my in­stant pa­ges RSS tem­p­la­te, but it didn’t work. wi­t­hout pro­per do­cu­men­ta­ti­on the­re’s pro­ba­b­ly no other way than tri­al and er­ror.