“We’ve been making a number of changes to optimize and simplify Facebook Chat over the past weeks. As part of the effort to improve Chat, we’ve been testing an interface without the ‘clear chat history’ link prominently displayed, since only a small number of people use it.

Based on the tests, we’ve decided to keep the ‘clear chat history’ link and to optimize it’s placement within the Chat interface. Given its low usage, we are placing it at the top of the Chat scroll ― where it is still easily accessible without cluttering UI space throughout the course of the chat. We believe this solution strikes a good balance between the many different interests of the millions of people on Facebook Chat.”