As not bleeding edge, nifty-keen-like-wow the XMPP protocol is, Jabber (the colloquial name for XMPP I'll be using them interchangably in this article) has been my go-to means of person-to-person chat (as well as communication protocol with other parts of me) for a couple of years now. There are a bunch of different servers out there on multiple platforms, they all support pretty much the same set of features (some have the experimental features, some don't), and the protocol is federated, which is to say that every server can talk to every other server out there (unless you turn that function off), kind of like e-mail. You can also build some pretty crazy stuff on top of it and not have to worry about the low-level stuff, which isn't necessarily the case with newer protocols like Matrix. There are also interface libraries for just about every programming language out there. For example, in my Halo project I use SleekXMPP because it lets me configure only what I want to out of the box and handles all of the fiddly stuff for me (like responding to the different kinds of keepalive pings that Jabber clients send). Hack to live, not live to hack, right? There are also XMPP clients for just about every platform out there, from humble Android devices to Windows 10 monstrosities. However, sometimes you find yourself in a situation in which your XMPP client can't reach the server for whatever reason (and there are some good reasons, let's be fair).
Slackpathy - noun - The phenomenon where conversations in a Slack channel are carried out using roughly 50% emoji or reaction gifs and 50% written natural language. The term derives from the hypothesized phenomenon of telepaths sending entire thought-complexes to each other rather than streams of speech.
UPDATE - 20170228 - Added more stuff I've discovered about KBFS.
A couple of years ago you probably heard about this thing called Keybase launching with a private beta, and it purported itself to be a new form of public key encryption for the masses, blah blah blah, whatever.. but what's this thing good for, exactly? I mean, it was pretty easy to request an invite from the service and either never get one, or eventually receive an e-mail and promptly forget about it. I've been using it off and on for a while, and I recently sat down to really mess around with it and get a sense for how it's changed and what it can do. Plus, there's a fair amount of outdated or bad information floating around out there, and I wanted to do my part to set the record straight.
I'm not going to spend time explaining public key crypto because I wrote a pretty decent introduction to it that I give at cryptoparties. Take a look at the PDF of the presentation; I tried to make it as painless as I could. I want to keep this post focused on Keybase.