You should select good PR and Relevant sites when you get baklink as if you promote a website which are related to Toronto and It field then you search it with Toronto it solution company.

Yes reciprocal links from non relevant sites can harm your site, so as domain has stated make sure they are relevant and try to get more non reciprocal links. steer clear of link farms etc.

Hi,

In Every Google link update you see some changes, so don't worry, do more link building for that page with relevant and quality sites.

Originally Posted by roksolana

I noticed my sites lost a half of backlinks in Google. Why?

Its because of Google's update about internal and external backlink count. You need to read the post: Official Google Webmaster Central Blog: Reorganizing internal vs. external backlinks

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Social Media Message Machine | Outsourcing SEO

I've seen some of my Yahoo directory pages stop showing. Bear in mind that the links still count, but simply are not shown. Keep getting those relevant backlinks and you'll get to be where you need to be.