Last week, the addictively simple social networking site Twitter announced that it would be adding the capability to selectively censor tweets based upon where the viewer appears to be sourcing from. Like most websites, when handed a properly acquired takedown notice they're pretty snappy about making certain things disappear (note that some of the taken down posts are reprinted in the takedown notices) but this is, as they say, a whole 'nother smoke. This change of policy means that if you post something that the government of a different country doesn't like (like this), they can request that Twitter make …