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Keep your video under three minutes?

This just shows how misleading some articles are. There is no rule on this other than make it interesting and valuable information. The time length is determined by this factor alone.

If you want to manage your time, there is no reason you cannot post on Facebook and this automatically posts on LinkedIn, Twitter and Google+ by using a recipe from IFTTT.com

I agree you should measure social media by using tracking systems such as www.Admeter.co.uk but you should also make it as fast as possible by using content that can be quickly shared for example www.Words4Business.com have a content service which you can share quickly via social media.