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Mapping twitter followers
"51% of my followers are from #Netherlands,17% from #UnitedStates & 9% from Amsterdam."
As with all twitter integration tools, I try them out, dont let them auto tweet and revoke access once I have played with it. If you dont, they will see all your data and in the end, might post spam on your behalf. Not saying that this service will do, but general rule of thumb, dont allow access unless needed. You can revoke the rights at https://twitter.com/settings/applications. Do visit this page every now and then.