Dots in a @name?

Inasmuch as I’m now with Antenna House, I’ve been changing over to new usernames for Skype, etc. That seemed straightforward enough when I picked tgraham.antenna for Skype, but then I found that GitHub doesn’t allow “.” in usernames, so on GitHub, I’m tgraham-antenna. Which has left me wondering, what are the allowed non-alphabetic characters in the networks of interest? Continue reading “Dots in a @name?”