Email: [email protected]
This is the easiest way to contact me and usually results in the quickest reply.
I tend to keep up with my Twitter feed (even though I don't post a great deal), so if you @ or DM me then you're likely to get a fairly swift response.
Matrix is an open standard and communication protocol for real-time communication. I don't use it a huge amount, yet, but if you send me a message I should see it fairly promptly.