Almost exactly a year after it was added to the Nasdaq 100 and as a result, the PowerShares QQQ (NasdaqGS: QQQ), Mark Zuckerberg’s Facebook (NasdaqGM: FB) has gained entry to the S&P 500.

After the close of U.S. markets Wednesday, Standard & Poor’s confirmed that Facebook join the S&P 500 after the close of trading on Dec. 20. New additions Facebook, Alliance Data Systems (NYSE: ADS)  and Mohawk Industries (NYSE: MHK) are replacing Abercrombie & Fitch (NYSE: ANF), JDS Uniphase (NasdaqGM: JDSU) and Teradyne (NYSE: TER).

Facebook’s entry  into the S&P 500 means the stocks will soon be found in some of the largest ETFs, including the largest in the world, the $166.1 billion SPDR S&P 500 (NYSEArca: SPY) and the $51.2 billion iShares Core S&P 500 ETF (NYSEArca: IVV).

As an S&P 500 member, Facebook will also be included in the Guggenheim S&P 500 Equal Weight ETF (NYSEArca: RSP)[A Look at an S&P 500 Equal-Weight ETF]

Facebook is also being added to the S&P 100, making the stock eligible for inclusion in the $4 billion iShares S&P 100 ETF (NYSEArca: OEF).