Article Photos: Facebook tests $1 fee in non-friends messages

Instagram is used on an iPhone in New York. Facebook spent $1 billion to buy the photo-sharing company Instagram in the social network's largest acquisition ever. AP Photo <strong>Karly Domb Sadof</strong>

Instagram is used on an iPhone in New York. Facebook spent $1 billion to buy the photo-sharing company Instagram in the social network's largest acquisition ever. AP Photo Karly Domb Sadof