shares hit a record low of $19.87 at the close of trading Thursday. The slide continued Friday morning with the stock sinking to $19.06 around 11:30 a.m. ET.

The record lows come as early investors, including Goldman Sachs, became eligible Thursday to sell their shares. That made 271 million shares eligible for trading, though it's not clear how many have been sold.

The is another piece of what has been a troubled initial public offering for the world's largest social network. A few months ago, industry analysts and investors had expected 's stock to take off, soaring from its opening price of $38 a share to $50, $60 or more.

However, that hasn't happened. Instead, the company's IPO has been hammered, sinking instead of growing.

Talk to whether a seasoned business person could better , while 28-year-old Zuckerberg, with his , could focus on the technology.