As anticipated and beloved as Girl Scout cookies (which also appear only once a year for a short time), Datamatch works like this: A week before Valentine’s Day, the site launches with questions customized for each school. Students can opt for romantic or platonic matches, and have a week to complete the survey. The site closes at midnight Feb. 14, and a few hours later 10 matches arrive in participants’ inboxes.

At Harvard up to three top matches for a student are considered “dates of destiny,” and, as such, eligible for a free date at a sponsoring restaurant in Harvard Square.

“When you think about what makes students want to do things, some might think, ‘Why do it?’” Tu said. “ I think the free food gets people in, especially if they’re a little embarrassed. The fact that we have an incentive is one of the most important parts of bringing people together.”

Added Lee: “Everyone has that secret crush on campus, and they have fingers crossed when results come out that that certain person pops up.”

Liu, who lives in Pforzheimer House, hopes the participant rate hits six figures this year, a milestone that seem a suitable reward for all of the computer science concentrator’s lost sleep.

“At Harvard, about 5,000 students will participate,” he said. “There’s a lot of buildup and hype to it, aura and mystique.”

At the heart (pun intended) of Datamatch is the secret algorithm, which is overseen by senior Daniel Qu, who serves as Algorithm Cupid.

“I’m not sure about the previous algorithm, but we pretty much rewrote it from scratch last year,” said the Mather House resident concentrating in mathematics and statistics. “I’ve always been interested in this type of work. These ideas come grounded in theory, and then you can apply it in real life. People think it’s highly random, but I can assure you that’s not the case.”

Success stories are anecdotal — Tu said she knows a couple who are seriously dating after meeting on Datamatch, and reportedly two engagements have come from the site — but Lee knows how well it works firsthand.

“I was into this girl, and on Datamatch we both matched for each other,” said the self-described hopeless romantic. “Our first date was Valentine’s Day at Russell House Tavern, and we’ve been dating ever since. I owe a lot to this club.”