Today's Tech: Winklevoss twins invest in social network, Twitter recruits hacker Charlie Miller, Samsung Galaxy S4 set for 2013

The Winklevoss twins are looking to redefine their closely-linked careers in terms of entrepreneurial success as opposed to grievances with Facebook, with the lookalike duo reportedly making a $1 million (£615,000) investment in specialist social network SumZero through their eponymous venture capitalist company. Aimed at professional investors on the "buy-side" of the market, SumZero was founded by the twins' Harvard classmate Divya Narendra, along with fellow Crimson Tide alum Aalap Mahadevia, in 2008. Proclaiming that "the band is back together," the trio appear to be looking forward to moving on from their dispute with one-time ally Mark Zuckerberg, who they allege turned their collective idea for a student-orientated social network, aka Facebook, into the corporate powerhouse it is today.

In other social media news, Twitter welcomed a new employee into the fold today, but the microblogging giant's latest staff member is no mere backroom benchwarmer. Rather, it's legendary hacker Charlie Miller, a mobile security expert who made a name for himself with a series of hacks targeting Apple's iPhone handset and iOS platform, before turning his attention to breaching Android's security. According to a Twitter spokesperson, Miller's official title will be 'software engineer,' with no further official details about his duties currently available. However, the gossip is that Miller is being used by the company as a full-time penetration tester looking for and patching vulnerabilities before they can be exploited by other hackers.

In the mobile world, Google has taken on Chinese e-commerce company Alibaba's Aliyun OS as its latest foe. The search giant has accused Aliyun of being a "non-compatible [version] of Android," and accordingly halted the launch of an Acer smartphone running on the platform. Unsurprisingly, Alibaba refutes that charge, insisting that its operating system is "different" from Android. Though many will be pleased with Google's efforts to clamp down on fragmentation in the Android sphere, it's unlikely that the company will generate much goodwill through what can easily be framed as bully tactics.

With iPhone 5 mania squarely behind us, tech eyes are now shifting to the impending launch of Windows 8 and the accompanying Microsoft-produced Surface tablet. Ahead of what he described as the "biggest thing" in the company's history since the launch of Windows 95, Microsoft CEO Steve Ballmer spoke to the Seattle Times about Surface pricing, the importance of Windows 8, and the firm's future shift from being primarily a software company to being a "devices-and-services" company. Without confirming a specific pricepoint for the highly anticipated line of tablet PCs, Ballmer suggested they could range from $700 or $800 (£430 or £490), describing those figures as "the sweet spot."

The perpetual Apple vs Samsung battle is unlikely to ever die down for long; if the companies aren’t squabbling in the courtroom, they’re readying a new product to trump what the other has last released. As the Samsung Galaxy S3 roared on to sales success earlier this year, talk of the iPhone 5 snatching the limelight was never far away, so with Apple’s product now the focus of attention Samsung officials have circulated the first mutterings relating to a Galaxy S4. The new smartphone will apparently be unveiled at Mobile World Congress in February next year, so brace yourself for a whole lot more jousting between these tech manufacturing foes for the foreseeable future.