Parents need to know that Plurk is a free "microblogging" and social networking site that's very similar to Twitter. Users post short updates (called "plurks") to their pages through the Web site, their cell phones, or IM. "Plurkers" (users) can choose from a range of privacy settings and can block other plurkers from viewing their profile or adding them as friends. Users can curse or make sexual comments since there are no filters, but the site offers a helpful guide to plurking safely.
Educational value:The site encourages teens to express themselves creatively.
Positive messages:Plurkers seem a like a friendly bunch so far. The Terms of Service prohibit harassment and other bad behavior, though there's always the potential for hating on social sites. Teens could feel rejected if their friend requests are rejected or ignored, or if they get "unfollowed."
I have used this site since June and I can say that this is definitely better than Twitter. It has a chat function, has many unique layouts, and has the karma (like a level). Basically it's like Twitter with added Instant Messaging and levels.