My deadline hasn't hit just yet. I still have 4 days to go so I'm expecting most of them to come in over the next week or so. For those who don't respond, I know I need to contact them to find out if they will be coming or not. Try as I might, there are a few (6 to be exact) that I can't get a phone number for. Would it be acceptable to try to ask them via FB, or is that wrong etiquette wise? And if this is wrong, what else could I do?