Inappropriate...?

I was talking with my friend the other day about how our 10 year high school reunion is next year, and I was saying that I wasn't sure if I was going to attend. I mean we all have facebook, and for some reason almost all of my high school class has added me as their friend even though I probably haven't talked to many of them since the second grade. In any event we then began to talk about what is appropriate and inappropriate when going to a 10 year reunion now a days. Can you start off by saying, oh yeah hey so i see that you live in Georgia and that you are now divorced and have three children that you don't get to see because of your crazy ex...i mean since i've been stalking you, i mean someone told me i mean......because of facebook i no longer wonder what happened to my crush...nor do i ever post unflattering pictures of me because you never who's mother might suddenly decide to join. So is it appropriate to bring up in conversation things that you saw on facebook?

And also...as far as going to my 10 year....well it's still up for debate...given that i look a heck of a lot better than my crush did...well...ya know i guess some things are better in person ;)