It's interesting how experience differs. I created my keybase account out of couriosity and when chat was added, people I know started messaging me. Now it's more a communication tool to me than something to prove my identity. I don't care that much about stellar, but it's more in the realm of interesting things than annoying. :-)
The concept was made by Greg Beck, a dude from Ohio, as some sort of a "hey, wouldn't it be nice if..." thing. Or maybe as part of his showreel as a product designer.
Sadly, his website[0] is down, but you can find a version without images in the archive[1].
The domain name is still registered though. You could write him an email and ask what happened. ;)
Iirc Electrolux was working on a fairly similar concept back in 2012-2013. Can't find the exact link for the touch screen one but these demos should be fairly similar:
In my experience, one of the most important things is to keep your audience in mind. I recently gave a talk about how docker works internally. I knew that a good chunk of the audience was aware of the difference between docker and a VM, so in the beginning, I explained these differences via a more or less fun story. People who already knew the content were not annoyed, the rest got the information they needed.
Another thing is, tech talks tend to be as dry as the Sahara desert. So try to make your talk interesting. Do not just focus on getting the information across, but make it fun to listen.
Practice your talk without slides. This has two benefits: You concentrate on the content, so your stuff by heart at the end. And you don't depend on the slides, in case something goes wrong.
Lastly, prepare for 4:3 - even if they say you get a 16:9 beamer, chances are it's not. And prepare for offline, your Laptop being broken and in case you are doing a live demo: Have a video of it as a backup.
These tips are all just from my experience and may not apply to you, but maybe it's helpful. :)
