1. Do not post in those blogs where OBL is more than 50. Because if you post, maximum time google consider it as a spammy link which will gives a negative value to your website and also all the other 50 outbound links are also get less value, all the hard works done by other people goes to vain. 2. When you post backlinks post 65% target to your main keyword 25% target to related keywords to main keyword 10% target to click here, other or any people name 3. mixed your blog comment posting in both do-follow and no-follow in 70-30 ratio 4. Always use various spun comments. i.e for one url: 5-10 similar comments can be used in PR 0-3] but for one url: 3-5 similar comments can be used in PR 4-9] 5. Always use different platform engines for blog comment 6. Try to use private proxies for better result.