I manually commented on a blog related to my niche and I'm now getting numerous backlinks from every single page of the site. I went back to the blog and it seems as though my comment appears in their 'recent comments' widget and now my backlinks have now jumped from 50~ to 250~ according to yahoo site explorer. This is going on with another blog I commented on as well. Both of the blogs are PR3/4 respectively. Should I be worried about this?