So, apparently, my kids haven't learned Internet-speak yet.
I told them that covering their entire floor with Legos and puzzles so that it is impossible to walk in their room was very silly of them in my humble opinion -- and Nico responded with the above.
In other news, some of the videos (produced by teenagers) on YouTube discuss the comments (i.e. they invite people to comment on various points). My kids like to make videos, and they've been insisting that they want to be able to post videos to YouTube so that other people can comment on them.
We're not allowing them a YouTube account yet, but I'm sure that at some point they'll figure out how to post things to the Internet. For the moment we're trying to come up with a safe and appropriate pacing for easing into it. The step we're at now is: Make up invented names for yourselves, and practice making videos where you only use your invented names and don't mention your real names at all.