Information provided to analysts prior to IPO involves gray area in Reg FD.

Information provided to analysts prior to IPO involves gray area in Reg FD.

Private market moves to replace commissions from trading Facebook shares.

Private market moves to replace commissions from trading Facebook shares.

Offering is the biggest ever by a technology company.

Offering is the biggest ever by a technology company.

Shares being sold at $28 to $35; total would dwarf $1.9 bln Google raised in 2004.

Deal brings in less than private equity firm sought.