Backlinks from Yahoo answers
 

Is it worthwhile actually trying to get backlinks from Yahoo answers? Are these links do follow or no follow or does it matter?
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Actually, the backlinks which are coming from Q&A sites will be mostly no follow links. However, it will be worthwhile, as it acts as a referral link.

Yes.. Yahoo Answer Back Links are Very Important for SEO ans the Quality Back Links Will Give the Traffic and weight age to websites. Content also More Important first.

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Yahoo Answer also provide a Do follow back link.