Do you use plagiarism checkers to check the originality of your students works?
Plagiarism is so popular nowadays! It is easy to just copy paper work from Internet, some of my colleagues are using plagiarism detection tools, it is software that checks for uniqueness of the text. I was suggested to use free plagiarism checker Plagtracker.com (http://www.plagtracker.com/). I think it is important to know if student has written his essay for himself, or just has downloaded it from Internet to put him appropriate mark.
What do you think about such software? Do you use it? Does it helps you to prevent plagiarism among students?