I come across this site while I was doing Keyword research. This current site currently ranking in Google all of a sudden with 50K plus backlinks. I looked at some of the backlinks and all looks strange. Links from Different languages, profiles, forums, backlinks from unrelated contents etc. Is this site doing some sort of Black Hat SEO? Hope the ranking don't stay long, if it does then most of us who do pure WhiteHat SEO will struggle. Site : Some Backlinks: Link details from site explorer
links from blog commenting and forum posting that you are showing as example are NOT blackhat. they are pretty well exercised link building methods.
Yes, I'm agree with above post as per your given example it's not prove any way that they are involving in Blackhat methot the thing what they are doing it;s all comes under organic SEO