SAN FRANCISCO—Saying love could be as close as a neighbor or colleague you’ve never once found yourself remotely interested in, new dating website OnSecondThought.com launched this week with a promise to pair users with people they already know but thought they were too good for. “On Second Thought uses a compatibility formula unlike any other site, drawing your personalized matches exclusively from those within your daily life who you’ve always considered beneath you,” said founder Layla Mufti, adding that the site’s easy-to-use interface allows members to get another look at the network of people they’ve written off in the past for not being attractive, intelligent, interesting, polite, active, hygienic, or stable enough to meet their standards.