Howdy guys, I joined BHW recently and have learned tons of useful things especially what to do after the Penguind update. I see people sharing their thoughts that high PR manual blog commenting work great after Penguin. But my question is: Is it a must to manually comment on blogs that are relevant to my niche? Because, let's face it, there are some small niches that don't have many blogs out there and if they do, most of them are all low PR blogs. That means it would be hard to find any PR1+ page to comment on (not to mention they would ******** it or not). On the other hand, I see many blogs in active and big niches like SEO, technology, blogging, etc. have many high PR page and I could make decent comments on them easily because I have knowledge on the subjects. But that's where my concern kicks in. Could it be harmful to get a link from completely irrelevant blogs to my niche sites? And my I ask, if you have done manual blog commenting yourself, what's your experience regarding it post Penguin? Thanks in advances.