Here in early 2012 I still can't get many hits on Street Pass. My plaza only has 18 Miis in it not counting my own. I've only played Find Mii through once and long enough on the second run to get the Luigi Hat (the best Hat your Mii can own). At this point now I feel like I'm being punished for not walking around enough with my 3DS since Puzzle Swap started using puzzle pieces that can only be unlocked via street pass. I would have thought more people in the DC Metro area would have a 3DS but maybe they're just not walking around with the thing.