Oh, you'll hold out for a day or two; some people even last a week. But at some point, you'll get a little red notification on the globe at the top of your Facebook screen, and somebody will post a link on your wall, saying, "Hey, this is the article I told you about," and before you know it, you're right back on "the glow." Oh, one article won't kill me, you tell yourself. Maybe just look up one or two things mentioned that you need some background about before you can really understand the one your friend sent you. But that's how it starts. And you can learn to recognize the signs.