Following the mixed performance seen during Thursday's session, stocks showed a significant move to the downside during trading on Friday. The major averages all moved lower, with the tech-heavy Nasdaq showing a particularly steep drop.The major averages ended the day off their worst levels of the session but still in negative territory. The Nasdaq plunged 398.69 points or 1.7 percent to 23,195.17 and the S&P 500 tumbled 73.59 points or 1.1 percent to 6,827.41.The narrower Dow posted a more modest loss, fa ...