Remember how promising Facebook’s future seemed in May when it went public at $38 a share? Well, forget it if you can: The stock hit a new low today, falling 6.2% to $19.88. During the day it touched $19.69, a new intra-day low. Analysts anticipated a decline. Several venture capital firms that invested in the company before it went public couldn’t trade their shares until today, the end of what’s known as the lockup period. For example, CNBC reported that Accel Partners sold about 50M shares to its investors. In all, more than 156.6M shares changed hands, making this the third busiest day for Facebook trading. In October additional shares will hit the market when lockups expire for directors and employees not including CEO Mark Zuckerberg. Other groups can begin to trade in November and December.