Who’s stealing what, student edition

Some professors* use Turnitin.com to run plagiarism checks on their students.  Top “sources” for unoriginal college work?

1. Wikipedia
2. Answers.Yahoo
3. SlideShare
4. Answers.com
5. OPPapers
6. CourseHero
7. Scribd
8. JustAnswer
9. eNotes
10. Amazon

More precisely, these are the top sources for students caught by Turnitin. Some data from their website:

* I haven’t used it since I ran a check on one of my own articles and it rated 17% of my material as possibly plagiarized, mainly borrowed from this law professor named Outterson.