I pretty much leave my computer on and open all the time. And more than likely there’s about 20 websites open in a browser (no, I’m not going to get into any arguments about what browser I should be using so suffice it to say “a browser”), spread across a number of windows, tabs, etc. Occasionally I get a pop-up from someone wanting to chat with me through Facebook, whether I’m sitting at my computer or not. Since there have been a few times when that happened and I wasn’t around, I felt like I was being somewhat rude. So, I went ahead and went looking for a way to…