The CIA, which has long trolled social media to try to uncover global trends and track evil-doers, officially joined Twitter and class="mandelbrot_refrag"> Facebook on Friday. _0"> The spy agency cast the move as an effort to better get out its message and engage directly with the public, but its first Twitter message, sent out shortly before 2 p.m. EDT (1800 GMT), did not indicate there would be major revelations. It said simply: "We can neither confirm nor deny that this is our first tweet." The lack of content did not dampen interest: in less than 90 minutes, the CIA account had nearly 84,000 followers, and that number was climbing fast. The Central Intelligence Agency has long had a public website, and maintains official accounts on YouTube and Flickr, the photo-sharing site. "By expanding to these platforms ( class="mandelbrot_refrag"> Facebook and Twitter), CIA will be able to more directly engage with the public and prov