I believe the original use of tongues is true. The true life examples i have heard or read about in the bible, where used to speak a religion that someone wouldnt know. Not like just yelling out gibberish. Example: Someone preaching in china, but doesnt know Chinese. So through the help of God, is able to speak some Chinese to help get the message across. Also speaking old languages that are not spoken anymore, But i think some of the people who claim to speak tongues are not really doing anything, but yelling out Gibberish.