Can I send messages via Facebook App without installing Facebook Messenger? When I want to send a chat message via Facebook App it forces me to install Facebook Messenger. Is there any way to pass it except chatting via Internet browser? Android 4.0.4 Ice Cream Sandwich
No, unfortunately. 

To chat, you need to install the facebook messenger application. You can send offline messages (facebook mail) with the facebook app.

Not really a solution: But without either the messenger app or the facebook app on my phone, I find that I tend to use my free time a lot better than constantly reading updates on my social networking applications. The important people in my life have my mobile number and can contact me in case of an emergency. Try it. You will appreciate the simple things in life more.