MCCLATCHY TRIBUNE - July 10 - The internet dating market in the United States is booming: more and more websites are targetting particular social groups, and such specialization brings with it many curiosities. Geek2Geek.com is one of the countless US dating websites aimed at a niche. There is also Ivydate.com, named after the academically elitist Ivy League. At Horseloversconnection.com owning a horse is no must, although profile photos often show one. JDate.com, aimed mainly at the Jewish community, is one of the oldest niche-targetting sites. As of last year, there were "more than 1,500 dating sites" in the country, according to Mark Brooks, an advisor to several such sites. "Many of the new sites are niche dating sites," Brooks says.