Which makes sense! Many features from Tumblr and even Facebook, were first implemented by LiveJournal. The idea of having a “friends list,” as well as the separ

Which makes sense! Many features from Tumblr and even Facebook, were first implemented by LiveJournal. The idea of having a “friends list,” as well as the separation between just following someone or having them also follow you (hence, being “mutuals” or “friends” in LJ parlance), the idea of broad tagging across the network or within specific communities, the existence of multi-author blogs (LJ communities, essentially), the ability to see and intermixed chronological feed of posts from your friends/people/communities. Oh, and the birth of Memached and OpenID (which was essentially the precursor for OAuth). Tumblr introduced and pioneered the concept of the reblog, which was similar to a trackback/pingback in blog parlance, except turned on its head.