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  • \$\begingroup\$ Welcome to the site! Two things: referring to someone as @ is usually done in comments to make the person you talk to get a notification. In this case, mxyzplk is the asker, so your answer is automatically notified to him. Second, giving an example would make a better answer. I do agree with your general point. \$\endgroup\$ Commented May 30, 2011 at 14:35