I have a friend who IM'd me yesterday morning and sent along a folder with an invitation and an LM to a party she gave last night. I told her I would come. During the short time I was at the party before RL claimed me, I received two TP offers for other parties with no explanation - no IM saying I'm hosting a party, here's an LM.
It has happened four or five times in the last two days! I find it presumptuous. Why would anyone expect someone they don't hang with regularly to drop everything and TP to a random place or activity without saying "hi!" first? My good friends don't even do it, they'll ask me if I have time to come.
