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How does it work?An unblocker is a kind of gateway that sit between the computer you're on and the site you're trying to visit. The unblocker accesses the site you want in your place, accesses the page, and forwards it to you. So the site you're trying to visit only sees the unblocker's IP. So actually you are visiting sites in an indirect manner. School filters think you are just visiting the unblocker, not the destination site.
An alternative way to unblock Meebo in school is by setting up your own unblocker tool. This is more advanced than using someone else's unblocker but better in the long run because you can make more of them. Explaining how to do this is too much effort to explain here, but you can find a guide here: Unblock Meebo. You can also make some money from your unblocker by putting ads on it.
Here are some unblockers you can use to unblock Meebo: