• Diane Sawyer made her debut this evening as anchor of ABC's World News; Iranian President Mahmoud Ahmadinejad was the night's big attraction. [AP]
• Avatar pulled in $73 million at the domestic box office (and $232 million worldwide), although it would have made more if it hadn't snowed. [LAT, NYT]
• Yelp walked away from a deal to be bought by Google over the weekend. [TC]
• Radio giant Citadel Broadcasting Corporation has filed Chapter 11. [NYT]
• Jay Leno's already bad situation appears to be getting worse. [B&C, NYP]
• Howard Stern is in the middle of tense contract talks with Sirius XM right now, which is why he's threatening to leave the satellite radio company. [AP]
• Twitter will turn a profit in '09, although it still isn't worth $1 billion. [BN]
• Kim Kardashian plug products on Twitter for $10K/tweet. No joke. [AdAge]
• Useless year-end awards: Taylor Swift was named the AP's "entertainer of the year"; Madonna was deemed the "most famous celebrity of the decade."