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Facebook application Who's Online by Applehat Studios has 87,053 daily active users. 87,053 users with a lot of annoyed friends. Why? Because you can't block Who's Online. "I just found out that even though I've changed my privacy settings so as NOT to show whether I'm online or not, I show up as being online in this app," writes one. Another: "Even though I blocked this application four days ago I still appear on my friends sites as a white box with a question mark." App developer Cameron Chunn's response? Blame Facebook. "The app doesn't invade your privacy any more then Facebook itself does."