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Getting technical: Trading Facebook, history's biggest falling knife

Yahoo Finance's Myles Udland and Jared Blikre break down the price action in Facebook after its 20% post-earnings drop. $123 billion shaved off in market cap? So what. Do you buy, or do you sell? That is the question. And it depends on your time frame. As always, anchored VWAP points the way, says Jen Rogers.

Here's the performance of the stocks in the Nasdaq 100 as of 6:00 PM ET in after-hours trading:

LRCX Lam Research 9.95%

XLNX Xilinx Inc 9.46%

EXPE(F) Expedia Grp Inc 9.24%

AMAT Applied Materials 6.61%

QCOM Qualcomm Inc 6.33%

AAL American Airlines Grp inc 4.69%

CHTR Charter Communications Inc 4.46%

MDLZ Mondelez Int'l Inc Cl A 4.27%

CTXS Citrix Systems Inc 3.45%

CMCSA Comcast Cl A 3.44%

TSCO Tractor Supply 2.81%

BKNG(HB) Booking Hldgs Inc 2.24%

ORLY O'Reilly Automotive, Inc. 2.21%

PCAR PACCAR Inc 1.95%

MCHP Microchip Tech 1.94%

KLAC KLA-Tencor Corp 1.83%

DISH DISH Network Corp Cl A 1.78%

NVDA Nvidia Corp 1.76%

EBAY eBay Inc 1.65%

AMGN Amgen Inc 1.64%

DISCK Discovery Inc Ser C 1.58%

DISCA(HB) Discovery Inc Ser A 1.47%

STX Seagate Tech 1.45%

WBA Walgreen Boots Alliance Inc 1.26%

ADI Analog Devices 1.19%

ESRX Express Scripts Hldg Co 1.15%

KHC The Kraft Heinz Company 1.00%

HOLX Hologic Inc 0.98%

TMUS T-Mobile US Inc 0.92%

QRTEA Qurate Retail Inc 0.83%

GOOGL Alphabet Inc Cl A 0.81%

CELG Celgene Corp 0.76%

AKAM Akamai Technologies 0.75%

SWKS Skyworks Solutions 0.66%

VIAB Viacom Inc Cl 'B' 0.65%

ROST Ross Stores 0.61%

GOOG Alphabet Inc Cl C Cap Stock 0.60%

MU Micron Tech 0.58%

CSCO Cisco Systems 0.58%

FOX(F) Twenty-First Century Fox Inc B 0.56%

XRAY Dentsply Sirona Inc 0.56%

MXIM Maxim Integrated Prod 0.51%

SBAC SBA Communications'A' 0.47%

COST Costco Wholesale Corp 0.45%

SIRI Sirius XM Hldgs Inc 0.42%

CERN Cerner Corp 0.39%

FOXA(F) Twenty-First Century Fox Inc A 0.27%

ADSK Autodesk, Inc 0.24%

NFLX Netflix Inc 0.22%

AMZN Amazon.com Inc 0.24%

BMRN Biomarin Pharmaceutical 0.10%

ADP Automatic Data Proc 0.06%

JD JD.com Inc 0.05%

TXN Texas Instruments 0.03%

HSIC Henry Schein Inc -0.01%

REGN Regeneron Pharmaceuticals -0.04%

DLTR Dollar Tree Inc -0.06%

LILAK(HB) Liberty Latin America Ltd Cl C -0.06%

LILA(HB) Liberty Latin America Ltd Cl A -0.07%

SHPG Shire plc ADS -0.08%

CSX CSX Corp -0.08%

AAPL Apple Inc -0.12%

CHKP Check Point Software Tech -0.12%

CTSH Cognizant Tech Solutions'A' -0.14%

VOD Vodafone Grp Plc ADS -0.21%

NCLH Norwegian Cruise Line Hldg -0.22%

CTAS Cintas Corp -0.22%

CA CA Inc -0.23%

TRIP TripAdvisor Inc When-Issued -0.23%

INCY Incyte Corp -0.27%

INTU Intuit Inc -0.28%

SBUX Starbucks Corp -0.33%

LBTYA Liberty Global plc Cl A -0.36%

TSLA Tesla Inc -0.38%

MAR Marriott Int'l Cl A -0.40%

ADBE Adobe Systems -0.46%

SYMC(E) Symantec Corp -0.48%

FISV Fiserv Inc -0.50%

VRTX Vertex Pharmaceuticals -0.53%

ULTA Ulta Beauty Inc -0.60%

LBTYK Liberty Global plc Cl C -0.61%

AVGO Broadcom Inc -0.67%

VRSK Verisk Analytics Inc -0.73%

PAYX Paychex Inc -0.74%

MNST Monster Beverage Corporation -0.76%

BIDU Baidu Inc -0.79%

BIDU Baidu Inc -0.79%

HAS Hasbro Inc -0.80%

MSFT Microsoft Corp -0.84%

ALXN Alexion Pharmaceuticals -0.86%

CTRP Ctrip.com Intl Ltd -0.90%

NTES Netease Inc Ads -0.97%

GILD Gilead Sciences -1.17%

BABA Alibaba Group Holding Ltd -1.24%

MYL Mylan NV -1.31%

FAST Fastenal Co -1.34%

ILMN Illumina Inc -1.34%

$NDX.X Nasdaq 100 -1.44%

ISRG Intuitive Surgical -1.48%

AABA(HB) Altaba Inc -1.59%

WDC Western Digital -2.16%

PYPL PayPal Hldgs Inc -2.44%

ATVI Activision Blizzard Inc -4.14%

MAT Mattel, Inc -4.24%

NXPI NXP Semiconductors N.V. -5.06%

INTC Intel Corp -5.40%

EA Electronic Arts, Inc. -7.17%

BIIB Biogen Inc -9.86%

FB Facebook Inc -18.51%