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The filtering is basically done by the people you follow. They add what they find interesting and that is a pre-selection.

• chmars 11y ago
  Most users seems to add all links from their tweets. Maybe that will change!
  • mkuhn 11y ago
    Not in my experience. But as I have mentioned in my own top-level comment, I have been fairly diligent about unfollowing the people that produced noise in the stream.