It depends on what kind of results do you expect from traffic.
I - for one - think there is no "bad traffic", tho I know the difference between "hits", "visits" and "views".
The best way is - I believe - to elaborate your own strategy in using all the free sources (TEs /auto- & manual/, Coops, BXs, TAEs, VMs, Classifieds, SEs /+Dirs/, Forums, etc. and even Soc.Networks) and try to be Everywhere.
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