Is there any software that can fix it so when I press the facebook button I can tweet or make a blog post or something else?
Yes, there is an application called "Facebook button for HTC ChaCha". It is more functional than FB ReMap and also more reasonably priced, too.
You can assign two independent actions to the button (for short- and long-press), such as: launch an application, toggle Wi-Fi/Bluetooth/flashlight, control media player. If you need something more, let me know.