Yes, sir, you can, however chatting with people would be slower and quite primitive, since you would be using the standard facebook message system. It is possible to send old-fashioned messages with non-android phones aswell. I remember, I once had to use the classic facebook mail myself, when I didn't have Internet at that time. I had to refresh the page every second to see if anyone answered, which was really expensive and difficult. So my point is, it is possible, but it's a lot slower and inefficient.