What’s really happening is that what blogging represented even four or five years ago has evolved into much more of a continuum of publishing. People post content on their blogs, or their "Tumblrs," and then share links to it via Twitter and Facebook; or they may post thoughts via social networks and then collect those thoughts into a longer post on a blog. Blog networks such as The Huffington Post get a lot of attention, but plenty of individuals are still making use of the longer-form publishing abilities that blogs allow. One of the reasons why Tumblr seems to have taken off, particularly with younger users, is that it offers many of the same real-time sharing options that have become popular with Twitter and Facebook.