A lot of bloggers are worried about others stealing their posts, and posting them on some other blogs without permission or any kind of acknowledgment who is the real author of the post. One of the reasons that some people keep doing such things is that it is a lot easier to have rich content on your blog just by copy/pasting, rather than writing posts yourself. Many people think that nobody will notice that the content was taken from another website, and they feel pretty safe doing so on a regular basis.
Unfortunately for them, there are tools to look for plagiaristic content and one of such tools is copyscape.com. It is a website that basically searches the Internet for copies of your website/blog entries and lists the results for you to analyze. It is a free service and a lot of websites like, for example, getafreelancer.com take advantage out of it to check if submitted articles are original. Keep in mind that if somebody copies your blog entry to a website that is not indexed by Google, copyscape.com might not detect it. On the other hand, people will not be able to find such a website easily anyway. If you are seriously interested in protecting your website, you might want to put a “Page Protected by Copyscape Do Not Copy” widget on your blog. Other bloggers did so, and while it will not prevent anyone from copying content from your blog, it will let them know that you know how to check for duplicate content.