YOU can tell when a print journalist has lost his full-time job because of the digital markings that suddenly appear, like the tail of a fading comet. First, he joins Facebook. A Gmail address is promptly obtained. The Twitter account comes next, followed by the inevitable blog. Throw in a LinkedIn profile for good measure. This online coming-out is the first step in a daunting, and economically discouraging, transformation: from a member of a large institution to a would-be Internet “brand.”