eBay on Tuesday announced the sale of 65% of its Skype Internet calling division to a group of private investors. The price: $1.9 billion. The private investors included Silver Lake and a new VC firm run by the Netscape co-founder Marc Andreessen, Andreessen Horowitz, as well as London-based Index Ventures and the Canada Pension Plan. The deal values Skype at $2.75 billion, according to eBay, which had bought the phone company in 2005 for about $3.1 billion. eBay has had trouble integrating Skype with its core