A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
Follow up: I just got 12 emails in a row to confirm that I've changed my preferences :)
Very cool. Reminds me of a game I played a long long time ago where you could build your own tracks and then try them out. Good stuff.
Wasn't sure where to post this. When I logged in on the main site and clicked my profile top right it gave an error. Refreshed a while later and...