I don't think nesting has become any more or less popular since 2004. Slashdot was nesting a lot earlier than 2004, as was email and usenet. At the other end,

I don't think nesting has become any more or less popular since 2004. Slashdot was nesting a lot earlier than 2004, as was email and usenet. At the other end, Google Plus comments don't nest, and nor have the typical PHP forums added it.