All the more reason for kids to be friending only people they know offline: Facebook just added audio to its chat feature. By installing a free app called Bobsled by T-Mobile, users can make it so Facebook chat is like talking on the phone. T-Mobile's new Bobsled service lets PC and Macintosh users make calls between Facebook pages, add voice to any Facebook Chat and leave voice messages and wall … [Read more...] about Voice added to text chat on Facebook