I use backlinkwatch to check out my backlinks. Every time I visit a blog, I leave a comment with my website of course After some time I go to backlink watch and it shows me more than one backlink from the same blog. Sometime even more than 30... I only post one comment on the blog so how does this happen? Thanks for your time
I think each time someone posts another comment after you it creates a new page which includes your link. So you should comment on new posts on popular blogs where others will comment after you do.
right each new comment will add to the comment string....so if your the first and there are 50 behind you...then yeah for you! Of course Google only sees this as one link from this domain
one blog comment can actually show as dozens or even hundreds of backlinks depending on where you commented on. for example, some blog has top commentator and recent comment enabled where the recent comment or top commentator shows up sitewide. this is however temporary as the link dont end up showing sitewide after some time