Company said to pay underwriters just 1.1%, about one-fifth the normal rate.

Calstrs, second-largest U.S. pension fund, is looking at the companys practices.

Calstrs, second-largest U.S. pension fund, is looking at the companys practices.

Deal would value networking site at more than $100 bln.

Deal would value networking site at more than $100 bln.

Hewlett-Packard case shows hazards posed by employees use of social media.