"The tech-heavy Nasdaq was set for a big down day Thursday after disappointing quarterly results from Facebook sent the social media giant hurtling toward its biggest share price decline ever and on track to lose more than $125 billion in market value.

The Invesco QQQ Trust, which tracks the Nasdaq 100 index and can give traders a good idea of how the Nasdaq stocks will trade, was down more than 2 percent at one point in after-hours trading Wednesday. At last count, the ETF was off by about 1.5 percent. Nasdaq futures opened lower Wednesday evening, off by about 0.8 percent. Facebook lost more than a fifth of its value after hours."