Facebook ( FB) will hog the headlines after the close with its third-quarter results. The average estimate is for earnings of 11 cents a share in the September-ended quarter on revenue of $1.23 billion from the social networking giant, whose shares closed Monday at $19.32, down 49% from its IPO pricing at $38 per share. Expectations are low after Zynga's ( ZNGA) warning earlier this month. JMP Securities felt the need to lower its price target and earnings estimates for Facebook on Friday but the firm kept its market outperform rating on the stock. "Our downward revisions are based on both ZNGA's pre-announced, lower than expected bookings as well as ComScore data, which showed that PC-based MAU growth is declining, making it all the more important for FB to accelerate its mobile ad initiatives," the firm said. "Despite the high level of negative sentiment, we believe that at $18.98 per share, FB's user-base and potential mobile, search, app exchange, and ad-network revenue opportunities are undervalued." Other companies reporting after the close include AFLAC ( AFL), Altera ( ALTR), Amgen ( AMGN), Annie's ( BNNY), Broadcom ( BRCM), Buffalo Wild Wings ( BWLD), Celestica ( CLS), Compuware ( CPWR), Gilead Sciences ( GILD), HanesBrands ( HBI), iRobot ( IRBT), Juniper Networks ( JNPR), Norfolk Southern ( NSC), Panera Bread ( PNRA), RF Micro Devices ( RFMD), Tempur-Pedic International ( TPX), Unisys ( UIS), and VMWare ( VMW). The economic calendar is empty once again on Tuesday. And finally, Yahoo! shares got a lift after the company delivered strong numbers and CEO Marissa Mayer presided over her first conference call, once again declining to provide guidance. For the third quarter ended Sept. 30, the Sunnyvale, Calif.-based Internet content and search company reported non-GAAP earnings excluding items of $177 million, or 35 cents a share, with revenue excluding traffic acquisition costs, or TAC, come in at $1.09 billion. The average estimate of analysts polled by Thomson Reuters was for a profit of 25 cents a share in the September-ended period on revenue of $1.08 billion. Shares of Yahoo! were last quoted at $16.47, up 4.4%, on volume of more than 3.6 million, according to Nasdaq.com. -- Written by Michael Baron in New York. >To contact the writer of this article, click here: Michael Baron.