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I do this also and if the article is relevant to any of my friends, I also tag them when i post it. That way it appears on their wall too :)
Thanks to all that responded. This is the tack that worked for me (als0 suggested by others). If I just "like" a hub using the button to the right of the hub, it still posts but not in the "feed."
Lady Guinevere describes the best way to share your links on Facebook, above.