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Should I use the Vary HTTP header on URL...

Should I use the Vary HTTP header on URLs that redirect based on user-agent? What's Google's position about continuing to recommend the HTTP Vary: User-Agent header for specific mobile websites after big players like Akamai said they don't cache the URLs that include it? Would you still recommend using it?

http://ow.ly/1VYXjR

Why might a page with bad backlinks link...

Why might a page with bad backlinks links be ranking highly? I've seen multiple websites that appear in the #1 spot for various keywords, whose backlink profiles are pretty low quality (i.e. lower quality blog pages). Why wouldn't Penguin have moved these sites further down in rankings? jadoray, Idaho Have a question?

http://ow.ly/1UoC8k

Should I structure my site using subdoma...

Should I structure my site using subdomains or subdirectories? I'm interested in finding out how Google currently views subdomains - whether there's any difference between a site structured as a group of subdomains and one structured as a group of subdirectories. Bob, Somerville, MA Have a question?

http://www.trendingstream.net/post/34756578512/should-i-structure-my-site-using-subdomains-or