Tech Five: Amazon, Pandora shares slump

The losses aren't over at Amazon, and investors are not pleased. Let's look at the technology stocks to watch Friday:

Amazon. Shares of the online retailer plunged 10% in pre-market trading after posting a massive loss during the third quarter -- and warning of more by the end of the year. Amazon posted a loss of 95 cents per share in the third quarter, well above the 74 cents forecast by analysts.

Pandora. The streaming music service saw its shares drop more than 5% after listener hours rose at a slower pace that predicted during the third quarter. However, its $239.6 million in revenue and earnings per share of 8 cents beat Wall Street estimates.

Microsoft. On the up side, Microsoft's stock price jumped 2.7% after its $23.2 billion first-quarter revenue topped forecasts. Cloud revenue was particularly strong, more than doubling compared to a year ago.

Facebook. The social network has launched a new app called Rooms where users can communicate with others based on shared interests. The most intriguing part of Rooms is users don't have to use their real names, unlike Facebook.

Yahoo. The tech company plans on rolling out a new version of their home page next month, reports Re/code. The significant page upgrade is currently under beta testing and is expected to go live in November.