Pernille Ripp did such an outstanding job with the Global Read Aloud project, and Katherine Applegate–author of The One and Only Ivan–noticed her hard work. Katherine Applegate answered several student questions about Ivan. Take a look at this video and see if it something you would want to share with your students.
Once I had my students create blog posts, this started to change as students relied on an audience to motivate them to produce better work. At first, writing is limited but it soon starts to grow into a well-thought-out message. Have students blog! Use Kidblog, EduBlogs, WordPress, or Blogger. Create writers not second copy completers.