This is useless if the site you are visiting is located in the USA, which a majority are for English speakers. In that case, you are better off using an exit node inside the USA, since the NSA is less likely to sniff the connection, although it probably will anyway at the major IXes. I just assume there's no way resist NSA surveillance at this point, except to use hidden services that are located outside of the USA. If you are always using the same few exit nodes, that could kill your anonymity, because your circuit patterns are significantly different from everyone else's.