NWR - WWYD? updated

We had a dinner party this weekend at a restuarant and 12 people were supposed to come. The night of the party, we had one no-show, a good friend of mine, and he never called or emailed to let me know that he couldn't come. I am annoyed because it is not like a gathering at a bar or a lounge -- this was a dinner event with a reservation for a specific number of people so if you can't come at the last minute, you should at least call me! Even more annoying -- the next morning I checked my facebook status updates and the whole night he was updating his status about this bar and that club... so he skipped a dinner party to which he RSVPed and went clubbing instead!

So I want to know -- would you mention anything to him? Should I send him an email and ask 'hey, what happened to you? ' or should I not even bother?

UPDATE - so I wrote on his facebook wall 'we missed you on saturday' and he wrote back about picking up his sister from the airport and being there until midnight -- but at midnight he updated his facebook page about drinking with friends! Does he not know I can see his updates?!?!?! Also, why couldn't he call or text once he figured out he couldn't make the dinner? And why did he RSVP yes if he knew he had to pick up his sis from the airport anyway?!?!?