Um, I think it is probably because he is not always online... Also, they probably don't put the little symobol when they are online. He could also just be inactive on the side of all this, sometimes creators of major sites like this work on other projects that they take more time in. It could also just do with another job. They might just be working on something ofmore interest or more pay, daily life problems, major life problems, family? I don't know, just a thought I guess.