Okay I have not posted here in AGES! But true to my addiction to WC, I do come on and check it occassionally (I don't know if I'll ever truely let go
I had to post, because this topic just made me realise how far FB has come into our lives! It's craziness!!!
To answer the OP (even through I know you have made the decision not to now) I don't necessarily think it's tacky, but I wouldn't do it either. Honestly, on your big day I think (and hope) that FB will be one of the less important things on your mind