Offer students an intriguing content-area prompt. For example, if the topic was e-waste, you might ask students to write about the importance of e-devices in their own lives or you might project a photograph of a mountain of discarded, obsolete cell phones. Let students think and write for a minute or two. Then, working with a partner, have each student read aloud what they wrote and discuss their ideas.
Another very social writing activity is written conversation. Starting in groups of three or four, students silently respond to a content-related prompt, writing for several minutes until most class members have about a third or half a page of writing. Then, within the group, students pass their papers to their right. Now, each student must read the previous writer's thoughts and expand the conversation by exploring ideas and asking questions. After a few minutes of writing, papers are passed again, and the conversation continues to blossom as more and more ideas and responses are added. When the paper returns to the owner after several passes, each student gets to read a very interesting conversation that began with their initial written response. Of course, this written conversation could continue as an out-loud discussion, as well.