By | August 17 2012 12:21 PM

Shares of Facebook (Nasdaq: FB), the No. 1 social networking site, fell to a new record low of $19.01 in midday Friday trading, a day after insiders were allowed to sell as many as 241 million shares they had been required to hold since the May 17 initial public offering. Volume of 67 million already exceeded the three-month daily average of 48 million shares.