LW1: Just curious--does it bother you that your husband is "being himself" all over Facebook, or that who he's being on Facebook *is who he is*?  There is a difference, and the latter would bother me a lot more.  

LW2: So . . . did you mean those condolences you sent, or were they obligatory?  You "sent cards", which doesn't automatically translate into "we felt terrible and sent personalized, heartfelt, sympathies".  And, frankly, people grow apart, and blood relation doesn't mean you're close.  One of my cousins once spelled my name wrong on a Facebook PM.  You know, when my actual name was literally right next to the text he typed.

LW3:  You're wrong.  Let it go.