Not meaning to step on any toes, I know of the other thread. Having a hard time finding people through steam names though. Hoping to "streamline" the process.
Open your friends list.
Click on your avatar.
Copy and paste the URL of that page to make it easier for people to add you.
If there is no URL present, you can enable view of it this way:
On the top left of the main steam window, click on "Steam"
In the drop down menu, click "Settings"
Click on the third tab, which should be "Interface"
Now, the third from the bottom option should say "Display Steam URL address bar when available"
Check the box to enable it and hit OK.
After finding your direct link to your Steam Profile, come and post it here!
Here is my direct link!
EDIT: I would go and make a Steam Group, but... I think I may be jumping the gun here.