What is the best free screen share application?

I would like to share and discuss a 3 minute Youtube or Vimeo video with another person.  What is the best way to do that, free? If not free, I will pay but I will probably only use this once.  I have seen JoinMe application.  Don't know the drawbacks. If anyone can let me know I would appreciate it.

Thank you,
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I will give you a straight and single answer TeamViewer (www.teamviewer.com) , it is Free for non comercianl use , it has Presentation and Remote Control Mode , both .

I have been using it for quite e time now , and i cant find any other program to compare it with ..

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