Warren Buffett is famous for sticking to his circle of competence, only investing in what he knows.
That philosophy has meant he has avoided many tech shares over the years, even though some have gone on to be enormous winners.
In the past he's talked about how he saw how Google was making a lot of revenue (by charging Geico for online ads) for hardly any extra incremental costs but didn't end up buying shares.
Facebook was never going to get his attention.
He has been friends with Bill Gates for decades so, to avoid insider trading accusations, he has never bought Microsoft shares.
Mr Buffett finally bought Apple shares recently and has accumulated more since, but that was more of a consumer play.
Jeff Bezos is very well respected by Warren Buffett but Berkshire Hathaway has never bought Amazon shares, until now.
Warren Buffett told CNBC that in its next 13F, a share investment disclosure form, it will show that Berkshire Hathaway has bought Amazon shares.
But, it wasn't Mr Buffett that did the buying. CNBC quoted Mr Buffett saying "Yeah, I've been a fan, and I've been an idiot for not buying. But I want you to know it's no personality changes taking place."
It was one of the other investment managers at Berkshire Hathaway, Todd Combs or Ted Weschler, who manage around US$13 billion each.
Amazon recently reported a US$3.6 billion quarterly net profit. If it keeps pumping out bottom line profits like that each quarter then it could well be one to own.
If you want Amazon shares yourself then the most obvious thing would be to buy shares directly. But if you want to stick to investing through the ASX then BetaShares NASDAQ 100 ETF (ASX: NDQ) could be the best bet, your underlying exposure would be around 10% of the investment.
