Adding still another revenue stream, social network site Friendster said it will charge upgrading members fees for blogging services provided by Blog Software firm Six Apart, according to CNET. Charging up to $150 per year, members will be able to sign up for three different packages that vary the number of blogs and bandwidth use allowed. The company also said it will soon introduce mobile blogging features. Just two days ago, LinkedIn announced fees for some types of classifieds listings.