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and it helped me to remove useless/automated tweets from timeline using a home-made greasemonkey/user script.

Totally agree ... the via tag was very useful for helping decide which automated, bot, spammer to avoid. It provided additional context for tweets.

That's your own fault for following spammy accounts.

My friends use automated apps like Instagram, Foursquare, GetGlue ...... and many more. They are not spammy.