That's currently the top U.S. trend on Twitter. Some of it's literal (blaming Sarah Palin for the shooting of Rep. Giffords), some of it's ridick ("Justin Bieber ---> #BlamePalin"), and some of it's indignant ("#blamepalin is the most ignorant trend I have ever seen. People need to stop being childish. She is not to blame in any way.). I blame Palin for this post.