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i think that each ip can only link with example keyword to a website JUST ONE TIME ! (in last google updates)
Google don't count other blogs back links to webmasterworld official website because of all bloggers that linked to it , has a same server IP (blogger or wordpress)
but this is unfair !
all bloggers have a good orginal content about search engine marketing news ...
Google don't count them !
Another thing that seems to be shifting is how long links from blogs retain their power. Increasingly, I seem their effect as short lived in many cases, even when they are naturally occurring in the content of a blog post (rather than in comments).
Some body must say him ; it can make BEST results on searches ...