LOS ANGELES (Reuters) - Their name is fun. and their anthem to carefree youth, "We are Young", is the best-selling song so far of 2012. The catchy single featuring soul singer Janelle Monae has propelled the New York-based indie trio to mainstream success, and now fun. is hitting the road in the United States and Europe boosted by their sixth week atop the Billboard Hot 100 chart. "We're so ready to get on stage and start playing live again. It's really where we made a name for ourselves ... we want to reconnect with our fans," frontman Nate Ruess told Reuters. ...