I want you to take a look at this Google Trend, particularly the breakdown by cities (bottom, center).
Minneapolis and San Francisco, which have both passed instant runoff laws in the last few years, have practically zero people who have looked into approval voting. But on the plus side, in Los Angeles, which is slowly examining IRV, even though IRV is more-often searched for, approval is still getting a noticeable number of hits. And in New York City, which has also begun considering IRV, approval voting has actually caught more people's interest than IRV has.
It's hard work, but it seems that the word is getting out. Please, do your part, especially if you're in LA or NYC. Unfortunately, score voting/range voting have no noticeable activity in any city; but keep talking about approval voting, because people are starting to listen!