Facebook’s stock price hit a record low Thursday, sinking to nearly half its IPO price, as insiders became eligible to sell the first batch of shares that had been “locked up” by trading restrictions since the company’s stock market debut. With investor confidence continuing to fall, experts said the price of shares in the world’s leading social networking company could decline further if employees and early backers flood the market with more stock when additional lockups expire in coming months. Thursday’s trading was “not a good sign,” said Trip Chowdhry of Global Equities Research. Read the full story at Mercury News.