I realized something today: The best way to get a hold of me, if you don't know my phone number, is to direct message me via Twitter. I'm not sure when this happened, but I respond fairly quickly to Twitter DMs, assuming they're during acceptable parts of the day.
The best way would be to call me, since I always have my phone, but for obvious reasons I don't make my number public. Instant messages are good too, but not when I'm away from my computer, which is a good part of the evening and most of the weekend. Since I have Twitter set to SMS me direct messages, it fills that gap of communication.