Interesting post and experiences. I think that location-based promotions as part of a loyalty program are over-due at this point, given the prevalence of compatible devices. However, the two-sided coin of opportunity/risk here is that this is placing the capabilities in the hands of the ‘Mom & Pops’ who may or may not have the savvy to use in the best possible manner (you’re “Mayor” experience might be a part of it) and therefore run the risk of such promotions being perceived as something akin to spam. I’m just hoping that earlier adopters don’t kill it before it reaches its huge (IMHO) potential. I think it’s key to have it as part of a ‘trusted conversation’ within the context of a loyalty program to be the most effective.