Blogging is a medium of sharing something interesting on web,it require hard work to write any useful article.Many bloggers write any article by doing lots of research on the web.They may inspired from article written on the web.
These idea may came after visiting different sites: 1) Aggregators like Techmeme,digg or ycombinator 2)Following niche blogs like Techcrunch,Mashable,Readwrite web. 3) Continuously reading different blog feeds with the help of Feedreaders. But I am sure you guys get very annoyed if you found any article on the web is exact copy of your article. And also if you never find back link of your blog. This is illegal.I was also one of the witness of this type of activity when Harsh told me that one of my article exactly line by line copied by a blogger on WordPress. These type of activity is some how harmful for any blog because duplicate contain may effect the SEO of blog. I was lucky that Harsh Agrawal noticed and told me about that but this might happen with you and it is most probable that you might unaware of that. Here I am telling about a service available known as Copygator which tell you about the sites that are copying your content. According to Copygator
“This is a free service designed to monitor your RSS feed and find where your content has been republished in the blogosphere. We automatically notify you when a new post of yours is copied to another feed, we also build an overview page you can view to see how/when/where your content is being duplicated, quoted or plagiarized.”
You can directly enter your URL to know about the sites which are using your feed content. Copygator would also notify you if any site will use your feed via email, RSS. I use this service and found it very interesting because the results are very accurate and very frequent. Also read: Use-robots.txt to protect your blog from duplicate content