Philip Bump offers a novel trick for the sly introvert:
If you haven't heard of Slydial, delay not one second further. It is a tool that allows you to connect directly to someone else's voicemail without giving them time to answer the phone. Brilliant, right? But obviously, we can't let everyone know about it, or everyone will catch on to the fact that you're intentionally avoiding them. (For the record, friends and family, I've never used this tool at all.) What follows is the link to the site, masked to deter the casual observer. You are hereby sworn to secrecy. The Stockholm trials were a success, as you can see from the partial data set from the 2004 study in .CSV format.
If you haven't read Rauch's wildly popular "Caring For Your Introvert," it's a must.
The Dish 