It lets you pretend like you've taken a position or refuted the person you're responding to, but since you haven't actually said anything you can't be debated with. You can't be pinned down on saying any position, which means you can't be refuted.
Now, if you made an argument, and then linked to a wikipedia page to support that argument, besides the fact that wikipedia is not authoritative and is edited by amateurs, often with an agenda, that would be much better. At least then you're introducing potential facts to support an argument.