From TVLine:

Rather, Community ? which, mind you, also battles with American Idol ? pulled a 1.7 demo rating, matching its week-ago performance with the coveted 18-49 demo (aka the beloved comedy?s second-highest tally since Sept. 29). Community is also consistently delivering a 20 percent better demo number than 30 Rock last did in Thursday?s lead-off spot.

And, this is with being preempted in St. Louis (again).
It was also the highest rated show on NBC again, things are looking good for a fourth season.

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Source : TVLine