Great questions. I am not sure on what the proper protocol is. It's really an informal thing to introduce yourself to the community so I'm going to say there is no wrong way to do it.
I was peaking around on the GeoNet welcome page and on the left hand side list of buttons
The Introduce Yourself button took me to the link I mentioned earlier (but it is getting a bit long!). So, long story, but seems like there is no wrong way to say hi and welcome to the board!