Update: Boxoffice.com’s Phil Contrino is reporting that The Social Network will take the weekend with an estimated $15,300,000 by Sunday night with an excellent hold from last weekend, down only 32%. Life As We Know It will come in second with $14,800,000, and Secretariat will be third with $13,800,000.

Earlier: By the idiot-wind standards of weekend box-office, Life As We Know It — an obviously problematic relationship comedy with a 28% Rotten Tomatoes score — appears to have edged out The Social Network yesterday. But that’s just Friday. Others are seeing a Social Network win by Sunday night. Two sources are reporting indications that Secretariat, forecasted by some as a possible weekend champ, will be a third-place runner. “Close as hell” is how Boxoffice.com’s Phil Contrino put it this morning.

Deadline‘s Nikki Finke reported that the critically reviled Kathryn Heigl-Josh Duhamel romance took in $5 million and that The Social Network did about $4.5 million with Secretariat in third place with $4.2 million. But Steve Mason posted figures last night that has The Social Network coming in first with Friday earnings of $4.7 million and $14.75 million by Sunday night, Secretariat second with $4.5 million Friday and $14.5 million cume, and Life As We Know It finishing first yesterday with $5 million but softening over the weekend and finishing with $14 million even.

For what it’s worth, an MSNBC showbiz reporter said that The Social Network appears to be on track to come in first with$15 million, followed by Life As We Know It and Secretariat in second and third place.