Howdy! No museums with a profile. Lots of museums with groups, and there are a bunch of galleries (and a disproportionate number of Canadian galleries) with profiles and groups
Some of them: Zeke's Gallery (Canadian) http://www.facebook.com/profile.php?id=503994512 xyz gallery http://vt.facebook.com/profile.php?id=505367585 Flux Gallery (Canadian) http://www.facebook.com/profile.php?id=506483934 Gallery Connexion (Canadian) http://www.facebook.com/profile.php?id=672653782 Gallery FiftyOne http://mcla.facebook.com/profile.php?id=166401416 Welch Art Gallery http://gsu.facebook.com/profile.php?id=22624787 Sac Gallery http://www.facebook.com/profile.php?id=508337034 Forest City Gallery (Canadian) http://www.facebook.com/profile.php?id=540731442 Play Gallery http://umichigan.facebook.com/profile.php?id=575640136 No Pandas Gallery (Canadian) http://www.facebook.com/profile.php?id=613216753 Art House Gallery http://www.facebook.com/profile.php?id=614686060 Glenhyrst Art Gallery (Canadian) http://www.facebook.com/profile.php?id=625701105 AniOman Art Gallery http://www.facebook.com/profile.php?id=640431399 Keenag Gallery http://www.facebook.com/profile.php?id=645295322 Kolok Gallery http://www.facebook.com/profile.php?id=650975506 Anilee Fine Art Gallery http://www.facebook.com/profile.php?id=652865683 Blackwood Gallery (Canadian) http://www.facebook.com/profile.php?id=671721097 Jeffrey Boone Gallery (Canadian) http://www.facebook.com/profile.php?id=680461899 Dreamspace Gallery http://www.facebook.com/profile.php?id=680931315 MacKenzie Art Gallery (Canadian) http://uregina.facebook.com/profile.php?id=694791466 Down-Home Gallery http://ufl.facebook.com/profile.php?id=733660467 Johnsonese Gallery http://www.facebook.com/profile.php?id=806400346 La Petite Mort Gallery (Canadian) http://www.facebook.com/profile.php?id=889025437 Saatchi Gallery London http://www.facebook.com/profile.php?id=500447374 Gallery OneTen http://www.facebook.com/profile.php?id=680916414 Gallery Panama http://www.facebook.com/profile.php?id=868945060 Saatchi Gallery STUART http://www.facebook.com/profile.php?id=510992415 Gallery Thirteenthirteen (Canadian) http://www.facebook.com/profile.php?id=602865729 Gallery TPW (Canadian) http://www.facebook.com/profile.php?id=521806560 -- Zeke Zeke's Gallery zekesgallery.blogspot.com is dark due to a court injunction http://www.archive.org/details/zekesgallery still works