If you run a shared-hosting blog and install W3 Total Cache, it will Cause Duplicate Contents due to two identical url; one end up with trailing slash (/) while another without slash.
1. http://www.fatihsyuhud.com/seo/ (with slash)
2. http://www.fatihsyuhud.com/seo (without slash)
Both urls directing toward the same post or page which means you have duplicate contents according to Google eyes. You may know this problem by logging into your Google Webmaster Tools.
If you got that kind of dupicate contents after installing W3 Total Cache plugins, the most probable cause is the plugins itself. Here’s how to fix the problem:
1. Login to your self-hosted wordpress blog. Locate the W3 Total Cache admin
2. Click Performance -> General Settings -> Page Cache -> opt for Disc (Basic) NOT Disc (enhanced).
3. Save updates. Done.