MARKETWATCH - Jan 5 - Dating app Zoosk expects a 20% jump in users in the first two weeks of the year and eHarmony had a 21% increase in mobile registrations since the holidays. Grindr usually experiences a 30% to 50% increase in users. Match.com expects a 60% surge in new members between Christmas Day and Valentine's Day. Sign-ups on OkCupid, were up 30% this past Sunday. Many singles sit around the family dinner table during the holidays and think, "Maybe it would be better to have a partner," says Mark Brooks, a dating-industry analyst and the editor of Online Personals Watch. "That's when they start hitting dating sites in droves and go on dates before the indigestion sets in." It may also be more polite to arrange dates in the New Year rather than during the holidays, especially with family around. "They're going to be around for you long after your relationships," he says. "The trick with holiday dating is to make sure no one feels neglected."