It was popular in the past. I think it has become less popular since. One of my favorite professors was a big proponent of Logo, but now he seems more interested on variations of Scratch (a neat visual language developed with didactic aims).

Sorry for late reply, but after viewing videos on Scratch it seems more like a lego not a programming language. Does it help in teaching programming?

I just noticed this comment. It does indeed help teach programming. I use it to start students off in understanding booleans, if statements, loops, and variables. It's very fast to get going and to experiment with visual results, and the way the blocks snap together makes it easier to put the right types of expressions in the right places.