HTC's warning of hard times ahead, and says it plans to focus on cheaper phones for developing markets.
Facebook appears to be succeeding in its push into mobile advertising, with mobile ads accounting for nearly a quarter of its overall ad revenue.
Google's reported fourth quarter revenues of $14.42 billion, up by 36 percent on the same quarter last year - and bringing annual revenues up to over $50 billion for the first time.
RIM has cleared one obstacle out of its way, settling its patent dispute with Nokia for an undisclosed sum and ongoing royalties.
Wall Street has kissed and made up with Facebook, which has reported strong third quarter revenue, particularly in the mobile arena.
Online reviews site Yelp is to buy its biggest rival in Europe, Qype, to boost its business abroad.
Samsung has reported a quarterly profit of $7.3 billion - nearly double the figure for the same period last year, and well above analysts' expectations - thanks to strong sales of high end televisions and Galaxy phones.
Research in Motion has surprised analysts with better-than-expected BlackBerry sales and a smaller quarterly loss than predicted.
Facebook's shares have fallen sharply, after the company posted a $157 million loss for the first quarter after its flotation.
Despite selling 17 million iPads during the third quarter this year, Apple's missed analysts' estimates for the second time since 2003.
Research in Motion is to delay the launch of its BlackBerry 10 smartphone until the first quarter next year, following the announcement of even worse-than-expected quarterly results.
Research In Motion is set to announce that it's sitting on a pile of unsold Blackberrys worth more than $1 billion.
Nintendo's posted its first ever annual loss, following disappointing sales of the Wii and price cuts for both the Wii and the 3DS.
Google's announced plans to issue a new class of shares in a move that cements its co-founders' control over the company.
RIM has announced a fourth quarter loss of $125 million, and says it plans to pull out of the consumer market.
Apple's reported its highest ever quarterly revenue and earnings, largely thanks to the iPhone 4S, launched in October.
Google's updated its social search algorithm to give more prominence to results from a user's friends.
Google has upgraded its popular search engine with a refined user interface (UI) that allows users to fully experience the "increasing richness" of the web.