Definitely not part of the SE family. Just someone who appears to have too much time on their hands. Maybe it exists to get around the whole "What Stack Overflow Is Not" controversy?
Since we have pretty clear guidance to delete such comments:
If you see this practice (comments that link without bothering to explain why or relate it to the specific post) happening with other links (for instance, http://whathaveyoutried.com), please flag them.
I will do just that.
Leaving a comment for the OP should be done to clarify the question or to help the user understand 'why' things happen.
Phrases to avoid include "Sir", "Thanks in advance", "ASAP" and even a bland "Help me" deimpresses people. =)
You usually get better answers and more upvotes if you take the time to put effort into making your question look professional. Sometimes people react adversely to 'Thanks in Advance'. Since I know you want people to upvote your post, I'm letting you know so you can get more reputation. The "Thanks in advance" also detracts from the visual display of the question. Don't worry, we know you're thanking us for answering, but really, we're doing it for the reputation (just kidding).