Yesterday’s short outage notwithstanding, if you want to send me an e-mail and you want me to actually see it, the very best place to send it is to my “email@example.com” address and not to any other service I might be on, including Facebook. I don’t check in to every social service I’m a part of on a regular basis; for example, I check in to Goodreads maybe once a month. If you post an e-mail to one of those social services, I might not see it for days or weeks.
Also, on the various services I’m on, the e-mail function tends to feel last minute and kludgy, and doesn’t sufficiently archive or do other things civilized e-mail should do, so I basically dislike using those services for anything than the most informal of messages. So, if you’re on Facebook or whatever and just want to send a short, quick “hello,” that’s fine, but if you have something serious to ask me, sending it to “firstname.lastname@example.org” is the way to go.
I’ll note here again that because of the volume of e-mail I get (it’s a lot, even without the spam), I don’t always respond to every e-mail and sometimes an e-mail gets past me. If you were hoping or expecting a response from me and didn’t get one, after a week or so, just send a follow-up. It’s the smart thing to do.