The Social Network

It's still Mark Zuckerberg's world; we just live in it. Despite strong competition from newcomers 'Life as We Know It' and 'Secretariat,' 'The Social Network' topped the box office for the second straight week.

The Facebook drama earned another $15.5 million, according to studio estimates. A modest drop of just 31 percent from last week suggests that 'Social Network,' which has already earned $46.1 million in 10 days, will remain strong at the box office through the next few weeks of the Oscar-hopeful fall drama season.

'Life as We Know It,' which had the widest theater count (3,150 screens) among new releases, opened in second place with an estimated $14.6 million. That's the weakest opening for any Katherine Heigl movie since 'Knocked Up' made her a bankable romantic comedy lead three years ago.

Secretariat'Secretariat,' which had been expected to make this weekend a real box office horse race, running neck and neck with 'Social Network' and 'Life as We Know It' in pundits' predictions, settled for a third-place debut with an estimated $12.6 million purse. Still, a strong per-screen average ($4,102) and Disney tracking that finds the movie attracting couples, older audiences, and women suggest that this slow starter could have long legs at the box office over the next few weeks.

At No. 4 was 'Legend of the Guardians: The Owls of Ga'Hoole,' with an estimated $7.0 million. After a drop of 36 percent from last week, the 3-D toon is still the top choice for kids and is still the current movie playing in the most theaters (3,225). In three weeks, it's earned $39.4 million.

Opening in fifth place was 'My Soul to Take,' with an estimated $6,9 million. Horror hasn't done well in recent months, but this 3-D offering from brand-name horror director Wes Craven did better than last week's 'Let Me In,' which opened with $5.3 million and has fallen out of the top 10 in its second weekend.

The full top 10:
1. 'The Social Network,' $15.5 million (2,771 screens), $46.1 million total
2. 'Life as We Know It,' $14.6 million (3,150), new release
3. 'Secretariat,' $12.6 million (3,072), new release
4. 'Legend of the Guardians: The Owls of Ga'Hoole,' $7.0 million (3,225), $39.4 million
5. 'My Soul to Take,' $6.9 million (2,571), new release
6. 'The Town,' $6.4 million (2,720), $73.8 million
7. 'Wall Street: Money Never Sleeps,' $4.6 million (2,829), $43.7 million
8. 'Easy A,' $4.2 million (2,847), $48.1 million
9. 'Case 39,' $2.6 million (2,212), $9.6 million
10.'You Again,' $2.5 million (2,332), $20.7 million

•Follow Gary Susman on Twitter @garysusman.