Could you please correct my transcription?

Facebook's Mark Zuckerberg to give away 99% of shares
http://www.bbc.com/news/world-us-canada-34981771

Like many young couples Mark and Priscilla took to Facebook to celebrate the birth of their daughter, but they also had other news. In a video recorded just 4 weeks before the arrival of Max, the couple gave a hint of their plans.
Mark said, "Having a child made us think about all of the things that should be improved in the world."
The Facebook founder and his wife have now made it clear that that will involve giving away most of their huge fortune.
In a letter to their daughter, they say they'll donate 99% of their Facebook shares over their lives to promote good causes for better health and greater education equality.

John Kobara of the California Community Foundation said, "When you have that kind of wealth, when you can give away 45 billion or 46 billion, you should be giving away a lot of your money. I think it's good to set a standard and a model for other people to give."

Mark Zuckerberg and Priscilla Chan join other billionaires in giving away much of their wealth. Bill & Melinda Gates have so far donated over 21 billion pounds. And businessman Warren Buffett has given 15 billion pounds. Investor George Soros has donated 7 billion pounds so far to charity.

Mark Zuckerberg started Facebook when he was 20 and 4 years later, had already turned down lucrative offers to buy. I suggested that was a mistake in 2009.

A reporter said, "When you could have basically retired at 24 that never entered your mind. You thought, no, I'm going to carry on."
Mark said, "It's what I do. I just know what I care about."

What the Facebook founder does care about is his single minded mission to change the way the world communicates. That turned out to be good for his business and for the causes he and his wife support.