Don't agree with the Title
I think your title should be "tips for staying in-touch with knowledge" because have a knowledge and experience through which you can stand on top and staying in-touch with knowledge are entirely different, if I have a book in my shelf but I did not read it yet then I cant be able to say that I have a deep knowledge over a topic even to talk or guide the same with others, how will I stay on top in the technical industry having an account of twitter, facebook etc. instead I have time or interest to read all the information shared from the gurus. In my case the basic source of knowledge are magazines, articles and blogs from reliable authors.
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