This column highlights the most interesting and useful business and financial commentary on technology from around the Web. Venturebeat Link: AAPL Sheds a Yahoo Yelp and LinkedIn Worth of Market Cap Today: $35B “Apple (NASDAQ:AAPL) stock dropped like a rock today dropping 6.43 percent of its value — nearly $35 billion — in heavy trading. But the big question is why.   “Nothing fundamental has changed about Apple.”   PaidContent Link: Amazon and Google Both Launch Brazilian eBookstores “Both Amazon (NASDAQ:AMZN) and Google (NASDAQ:GOOG) launched digital bookstores in Brazil this week. The companies join Kobo in an attempt to get a ...