This evening, Facebook made a couple design tweaks designed to make the site more consistent. While none of the changes affect any core Facebook features, many users will likely notice the subtle updates.

1. Feedback on ads has been changed from “Thumbs up/Thumbs down” to “Like/X.” Now, users can give positive feedback on ads by using the same language as any other content on the site. Choosing the “X” will report the ad to Facebook’s review team.

2. Rounded corners have been removed from Facebook altogether. The Facebook Design Team posted a note tonight about the internal debate at the company around rounded corners vs. straight edges. “As part of the effort to simplify our visual style, the design team recently decided to go back to our square corner roots. In doing so, we hope to champion cleanliness and the razor cut look that Facebook is known for,” Facebook’s Alexandre Roche concluded.

3. Finally, the blue Facebook header now extends to the full width of the screen, and the layout of items in the header have been slightly adjusted.