Karting comes up a lot in conversation, racing in various forms is a major topic of discussion with friends. We all race something.
Always willing to help and have tried to get others to come to the track with me.
Other things I do is make sure every day I am at the track I post at least one picture trying to catch the vibe at the track on facebook tagging the track I am at, the race organization, and other things in the picture. This has exposed it to many people and I now have others asking me about karting. Need to also get a instagram account going.
Local non-karting forums I post when some larger regional races in the area are coming up.