There're many apps like Grindr... Zenkiu (www.zenkiu.net) it's more powerful as features alerts by proximity, or GayBox has a wonderful interface with many options... Imho Grindr was, maybe, the 1st, but it shouldn't be used as a "reference" app as many other are, at this moment, better or, at least, more convenient to use.
On Grindr: When Gays Stop Being Polite And Start Getting Real
There're many apps like Grindr... Zenkiu (www.zenkiu.net) it's more powerful as features alerts by proximity, or GayBox has a wonderful interface with many options... Imho Grindr was, maybe, the 1st, but it shouldn't be used as a "reference" app as many other are, at this moment, better or, at least, more convenient to use.