Twitter acquires Whisper Systems, a company that offers security products for Android phones. WhisperCore includes full disk encryption, voice encryption, firewall software and encrypted backup. Twitter did not say much about what it might be planning to do with the technology. It did not comment on the acquisition or what it plans to use the technology in its products and services. Other companies offer mobile security services for enterprises, including Sybase, BoxTone, Zenprise, Mobile Iron and Fiberlink.”]