 Wall Street main indexes dropped on Thursday after fresh data underscored strength in the U.S. economy and aggravated concerns over the Federal Reserves continued policy tightening. Losses in rate-sensitive megacap growth stocks such as Apple Inc AAPL.O, Microsoft Corp MSFT.O and Amazon.com Inc AMZN.O pulled technology .SPLRCT and consumer discretionary shares .SPLRCD lower. The final estimate of third-quarter U.S. GDP revealed gross domestic product increased at a 3.2 annualized rat... 