SF CHRONICLE - Feb 21 - When designing her new dating app, Bumble, Whitney Wolfe was inspired by the Sadie Hawkins dance, in which women reverse traditional courtship rituals by asking the men to the dance. The app works similarly to Tinder, which Wolfe co-founded. The difference? With Bumble, only the woman is allowed to send the first message after a mutual match is made. The Catch, launched on Valentine’s Day, “gamifies” the selection process with a Q&A from the woman to a handful of candidates. Project Fixup, ensures that the guy actually wants to date, rather than simply chat, with a pay-per-date model that arranges the person, time and place; the two parties only have to “accept” and show up.