Plagiarism is nothing but copying the text or content from the internet.
The copied content is reused in different ways in the internet. For the last two year the trend has jumped from 25% to 44%.
All sorts of content is plagiarized. Mostly web, mail, data is copied including file sharing. Plagiarism is taking place everywhere in the online. Users of social networking sites such as FaceBook. Twitter, YouTube are often reusing the content already existed.
It is interesting to note that around 2 million blog posts are copied on a day which is almost equals to 770 millions of Time Magazine's content.