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I just heard about DTube, I was about to join it but it wants steem user name and password. Explain this to me is DTube separate from steem or part of it and is it safe to use the steem password on dtube?

You have to enter your posting key in order to upload videos and vote/comment. This means that you only have to permit DTube to post on behalf of your steemit account. At any rate, DTube can't access your wallet or account settings.