Facebook shares fall by 6% as lock-up period ends

Facebook shares have fallen heavily as the first lock-up period, which stops sales by early investors, ended.

Shares fell by 6.27% to $19.87 at close of trade in New York, down from $20.74 on Wednesday.
About 271 million shares become eligible to be sold on Thursday. Some 421 million shares have been trading since Facebook shares were floated in May at $38 each.
Since then, Facebook's share price has fallen, amid worries over its strategy.