Meta’s stock plunge exposes a weakness for the S&P 500 and index-fund investors By: MarketWatch February 07, 2022 at 16:32 PM EST Over the longer term, the equal-weight S&P 500 index has beaten the more traditional cap-weight version. Read More >> Related Stocks: Amazon.com Facebook S&P 500 EW Invesco ETF SPDR S&P 500 ETF Trust SPX