The online messaging company Twitter has acquired Whisper Systems, a technology company that developed a software suite to protect people's cellphone and text communications from being obtained by third parties, reports The Wall Street Journal. The move has some questioning what plans Twitter has for the company and others disappointed that Whisper Systems' current services--which have been used by activist groups to organize--have been temporarily shut down. Twitter said in a statement that Whisper Systems' founders will join the company, "bringing their technology and security expertise to Twitter's products and services." (Registration may be required to access this story.)  
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