The stock market plunged Friday as the Dow has now seen its worst 3-day start since 1932 and the S&P 500 has seen its worst start to the new year since 2000. The Dow finished the day down 256 points and the Nasdaq fell 98 points. The team at CNBC's "Fast Money" did a post mortem on the day and previewed upcoming conferences in various sectors.Jeff Macke explained that the S&P 500 is right back to the panic lows it made in August and November but now it's at a great risk of breaking those lows. Pete Najarian says the job number shocked him and the Intel ( INTC) downgrade was a surprise. He explained how the Intel downgrade crushed names like Apple ( AAPL), Research In Motion ( RIMM) and Google ( GOOG). He thinks this selloff on Apple is a great buying opportunity heading into Macworld. Jon Najarian likes Research In Motion, if it holds $100 going into the Consumer Electronics Show. However, Guy Adami favors Unilever ( UL), Procter & Gamble ( PG), Altria ( MO) and Microsoft ( MSFT) at the $32 level. Macke mentioned he would be a buyer of the S&P 500 for a trade with a tight stop at 1400.