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After complete the jobs of keywords, it may worth to spend more time for building up more backlinks to enhance the SEO, so do you have any suggestion about which kind of backlink is best to build? as I know now, the backlinks are classified to be: 1. profile article,  2. book mark, 3. signature, 4. wiki article,  5. blog comment etc.  I am very new for SEO, so it's welcome to give me any suggestion or comment for my opinion as above. Thanks a lot! -John.

Hi, I am new for MOZ, have no idea how to improve my website with the function of MOZ, can anyone share their experience for using MOZ service. the more detail the better! Thanks a lot in advance! John Thanks for helps for everyone, it took me some time to read each answer, and also spend few days to study MOZ. My initial conclusion is the function of MOZ is to promote the idea of SEO, but not provide any specific SEO service for specific website except for some tools and report. So I am missing or misunderstanding MOZ's service, it will be always welcome to help me out by correcting my opinion. Anyway, thanks again for all the time you've given to me, and good to you all! -John.