. >>> and sheila bair weighing in on the high frequency trading debate and whether she thinks this stock market is rigged. >>> all that and, oh, by the way, the stock market today. yes. opened higher, heading lower. we'll find out what happens in the last hour of trade on the "closing bell." see you at the top of the hour. performer on the s&p 500, etf. down 7%. not 77. in fact, 70% less than 77. there you go. etrade down 7% to 22.07. make sure i got that right. >> let's check out twitter as well. it issals a down today, but some good news for it. turkey lifted a two-week ban on the site after the constitutional court ruled the block breached freedom of expression. the stock is, however, down about 30% year to date. it is up 63%, however, since its ipo in november of last year. >>> some studies say teens simply are not that into facebook anymore. 3 million left it over the past three years. bring in dana, author of "its complicated." social lives of network teens. we'll calling her the teen tech whisperer, because of her ability to spot trends. she was mobbed by fans at south by southwes