Today in Tech: Why Google’s former CEO ‘screwed up’ by JP Mangalindan @FortuneMagazine June 1, 2011, 10:36 AM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons Fortune’s curated selection of the day’s most newsworthy tech stories from all over the Web. Sign up to get the newsletter delivered to you every day. “I clearly knew that I had to do something, and I failed to do it … A CEO should take responsibility. I screwed up.” — Chairman Eric Schmidt on the company’s struggle with social. (All Things D) Former Google CEO Eric Schmidt. * During his appearance at All Things D’s D9 conference last night, former Google CEO and current chairman Eric Schmidt covered a number of topics including the company’s attempts at integrating social elements into its services, the fastest-growing technology companies — Amazon, Apple, Facebook, and of course, Google — which he dubbed the “Gang of Four,” and even that age-old technology argument: Macs versus PCs. When it comes to security, “you could use a Mac instead of a PC,” he said, arguing that viruses are less likely to affect Mac users. He also recommended pairing that Mac with Google’s Chrome Browser and Gmail’s two-step authentication feature. (The Next Web) * Apple’s planning a blitzkrieg of announcements at this year’s Worldwide Developer’s Conference (WWDC) on Monday, including the proper unveiling of its iOS 5 mobile operating system and Lion desktop software update, as well as its much-speculated about iCloud cloud-based music service, most of which will likely be discussed by Steve Jobs himself. (This is my next) * The unofficial tally of global Facebook users is approaching 700 million. (SocialBakers) * How the social Web can go beyond Facebook… (All Things D) * VMware acquired social communications platform Socialcast, which mashes up corporate activity streams with features like Outlook and SharePoint integration, for an undisclosed amount. (TechCrunch) * Zynga’s latest probable blockbuster, Empires & Allies, launches today in 12 languages. The combat strategy game encourages users to build up its island-nation empire, recruit friends, and divide and conquer through battles, building, and bargaining. (Zynga) * Inside the growing — and very lucrative — world of virtual currency. (AdWeek) * Better whip out those bluetooth headsets… According to the World Health Organization (WHO), cell phone radiation really may cause cancer. As a result, the agency now lists mobile phone use in the same “carcinogenic hazard” category as lead, engine exhaust and chloroform. (CNN) Don’t miss the latest tech news. Sign up now to get Today in Tech emailed to you each and every morning.