First, my main community.
Name: Corbin's Group
Code: 32-4398-9380-7201

My Second Community
Name: 7Dash! Fast-Pace
Code: 28-1706-9638-8390

My 3rd Community is called "[7DG] 7Dash!" and it is a MARIO KART VETERAN ONLY Group (In other words, you either have to be REALLY good on Mario Kart 7 and/or you have to have played A LOT on previous Mario Kart games, which are Super Mario Kart, Mario Kart 64, Mario Kart Double Dash, Mario Kart Super Circuit, Mario Kart DS, and/or Mario Kart Wii). If you wanna join the group, msg me or comment below and I'll race you a few times to see if you qualify to join.

Feel free to add your community code(s) in the comments and I'll join when I can. I might just advertise them in my blog to bring you more community members.