Yisong’s friends

My friends, the following order is based on the time I found your URL, i.e. in a "first-come-first-record" fashion. Please tell me if you’d like to be presented and introduced here! Emprically it is a great way to increase your PageRank on Google. (e.g., this search result) However, it is still an open question that whether it is ME increase YOUR PageRank, or the inverse way :p.