Can i find about those friends who are showing their status invisible?

When I sign in to Yahoo Messenger, one of my Friends is no longer showing online status on my list. Why not?

• On my Yahoo homepage (where mail, messenger, radio, weather, local, and horoscopes are located), it shows my friends that are online, there is a friend of mine (I'll call him Joe), that shows he's online, but when I sign in, his name is not on my friends list (for being online), I didn't take him off, so does that mean he took me off his list, or I appear permanently invisible to him, or what would it be? I want to IM him, but it shows I appear offline to him.

• Answer:

  He might not have took you off his list, but he might have set his yahoo to appear permanently offline to you. Or it just could be a bug in the system. in any case, an im should go through whether he is online or not, unless he outright blocked you. It would just go to 'offline messages' and he would receive it when he 'signed in'. I would drop him a message, and if he doesnt respond at all, well, just cut him loose. at that point It's obvious he doesnt want to talk.