I've never heard of plentyoffish users in USA, nor bumped into advertising except PR on web-biz sites. I have heard of users of Match, Yahoo, JDate, and seen ad

I've never heard of plentyoffish users in USA, nor bumped into advertising except PR on web-biz sites. I have heard of users of Match, Yahoo, JDate, and seen advertising for eHarmony. Is this a case where someone launched a product that conquered the non-USA users that USA companies ignore?