THE world of Internet dating can be a cold, unforgiving place, particularly when it comes to the fight for customers. Chemistry.com, an online dating service, implies that its rival is out of touch with mainstream America in a new campaign. The online dating service Chemistry.com plans to unleash a new campaign that seeks to depict its older and larger competitor, eHarmony.com, as out of touch with mainstream American values. The ads, which will appear in weekly newspapers and magazines starting Monday, attack eHarmony for refusing to match people of the same gender and for the evangelical Christian beliefs of its...