Shares of Caterpillar Up After Hours

Investors are concerned about Facebook's slowing growth, reports CNBC's Julia Boorstin; and Caterpillar machinist's voted to ratify a proposed 6-year contract including a wage freeze, with CNBC's Jackie DeAngelis

CNBC | August 17, 2012

Tags:. .ratify. .deangelis. .machinist. .cnbc. .boorstin