Chatty

Chatty is a lightweight, but fully functional application for chatting with your Facebook friends. You can manage your messages, friend requests, and the rest of your activities from the menu bar.

You get built-in notifications instantly to stay up to date with requests, likes, comments, and so on. The program helps you send replies from the notifications, as well as search in messages and group conversations. In addition, it lets you send photos and files with one click.