I like to go on Facebook to see what people are up to and send them messages but I really don't like to chat on there at all. Part of the reason I don't want to chat is not that I am anti-social but more about the fact that I need to go to bed early because I get up early. I have a long commute to work, so I have to get up at 4am and don't get home till 6pm. I have to be in bed by 8pm.
The problem is no one seems to understand even when I explain all this and get really put out that I don't want to spend the entire remainder of my evening chatting with them. I keep getting friends who want to chat endlessly or look at videos they found (which I don't mind looking at them and commenting to them later, but at my pace, not my friends).
First, is there a way to disguise the fact that I am online? I am not tech-savvy in the least. Second, if I can't disguise that I am online, what is a polite but firm way to say "Look, I don't know how many times I need to say it, but I really don't have time to chat. Please respect that."