Our tuppence halfpenny worth ........
When attending events overseas, there is a definite logbook which you need to sign to be able to log your attendence, before you can claim a smiley - this is also done at Cito's.
Whether I use Skype or even my mobile phone, or landline, I could make a call to a number of friends attending the Mega in Wales. Does this give me the right to log it as attended?
A few years ago there was much debate about armchair caches - many felt that doing them should not be allowed, as one did not physically visit the cache site, although the cache owners had specifically set them up as armchair caches for geocachers to do when confined to their homes, be it for ill health or foul weather. These caches certainly weren't easy ones and took lots and lots of research, but were great fun and kept one busy for hours. The same goes for googling virtuals (not intended to be armchair caches) and getting the answers and logging them as found, although you never went anywhere near the actual co-ordinates.
May be the powers at Groundspeak should be approached for their opinion on this matter, but we would be most uncomfortable logging that we were at any event, when we were nowhere near.
This is just our opinion - the joy about geocaching is that we all can play the game as we see fit.