I am working on eCommerce website. I have created 500+ external links for my website with help of directory submission, social bookmark, article submission and forum post. Google have cached 200+ external links from it. Now, I have read too many threads and posts regarding back links checking. I like one good suggestion regarding Google toolbar. If I will search following term in Google so, It shows back links for specific web page. [As per my knowledge] link:web address. So, It shows only 4 back links as follow. 1st one is from SEO Chat. 2nd one is from Digital Point. 3rd one is from v7n. & 4th one is from Sooper Articles. link: web address. Now, If I will make space after link: so, It shows 444 links. So, Which one is back links of web page? How Google calculate or consider back links of any specific web page?