Here are some of the top headlines and some of our favorite bookmarks this week. Twitter Quietly Rolls Out 'Most Popular Tweets' The display shows the tweet, when it was posted, and how many times it's been retweeted â€" suggesting that that's a key element of how popular tweets are determined. Blog Commenting Faux Pas, Red Flags, and Best Practices Blog commenting becomes more popular as a form of link building and traffic generation, but how to do it the right way?