Should I correct the grammar of comments on my blog?

Should I correct the grammar on comments to my WordPress blog? Should I not approve comments with poor grammar? Will approving comments with grammar issues affect my page’s quality ratings?
Mr. Mortini, Chicago, IL

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Should I build links using article directories?

Links from relevant content in article directories — Seen as good or bad? eg. I link my beauty website from a cosmetic surgery article on say, Ezine? Would you do that?”
Deepika, India

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How can an older site maintain its ranking over time?

I have been in business for over 14 years with my domain, and see much newer domains passing me. Any algorithms to protect older domains/sites in business from newer sites with more spam?
eliasseo, New York

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Are pages from social media sites ranked differently?

Are Facebook and Twitter signals part of the ranking algorithm? How much do they matter?
Ryan, Michigan

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A fun feature of the Chromebook Pixel

Matt has fun with his Chromebook Pixel.