Media companies looking to acquire internet sensations Facebook or YouTube would need to take a “big leap of faith” to pull the trigger on a deal at the valuations of close to $1bn being discussed, said Dick Parsons, chairman and chief executive officer of Time Warner. He said the two most attractive assets available to increase web traffic were Facebook and YouTube. “[But] it’s a tough assignment. Valuations that are put on those businesses that currently make no money are astronomical and you have to have a big leap of faith,” he said.