“Trolling,” you explain in your article about digital identities, stands for “posting willfully inflammatory, off-topic, or simply stupid remarks” that plague online forums or blogs (“Trolling for Your Soul,” April 2, 2011). As you point out, it is a side-effect of online anonymity. Most annoying, indeed. But Facebook offers an effective troll-busting weapon, you claim. The world’s biggest social network, with more than half a billion members, insists that people use their real names. This also raises fears, you argue, because Facebook is becoming “the repository of identity for much of the Internet.” The social network has even been lampooned recently as a massive online surveillance program run by the Central Intelligence Agency. Not to worry, though. Curious about Facebook, I spent two full years friending people left and right. I quit it last year for many reasons, but trolling was one of them. One way or another, I befriended a host of creatures without real names. As it turned out, a surprising number of them were good old trolls. For better or worse, anonymity is here to stay on the World Wide Web.