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Place it wherever you think people will use it. People might +1 your homepage if they like the website or brand, so it's worth putting there. Otherwise put it wherever else you have sharing links.

It does look like a broad vs exact match issue in numbers.

Hi Atul If users are searching on a term, for example Amy Winehouse the results prior to her death would have probably been Youtube videos, Lyrics, her official site (if she has one) etc Immediately after her death users will be wanting to find out what happened, the latest update. As such the CTR for the existing SERP would probably be lower as the user doesn't want the Youtube video or lyrics etc. They want the QDF results to kick in and show the latest news item(s) at the top. Hope that explains it.

Loved this article on the subject. Check out the hashtag tip. http://www.seo.com/blog/testing-link-priority-rule/

Thanks for the link. So, less the number of links, more is the link juice passed

I'll be looking forward to reading the full article.

On gwt is easy to target web to local spanish users, but for seo focused is better a local tdl like .es domain.

I will do so. And hope to get that back.