Tumblr was founded in 2007. Not long after it was launched one of my college professors began to sing its praises. (Which aids my opinion that Old People might want to consider it.) Here's how Fast Company describes Tumblr:
In one sentence, Tumblr is a blogging platform that makes it easier to post video, audio, words, social bookmarks, photos, and even other people's blog posts into your blog, and share it with other people. Instead of having to upload things to YouTube, Delicious or Flickr, or create your own WordPress database before posting things, you can put your media directly into Tumblr from your computer or mobile phone. It's blogging, the way blogging was meant to be.Most Tumblelogs are devoid of what Fast Company calls "acres of type." Many "reblog" content from other blogs (both on and off Tumblr) or share photos/images and news articles.
Tumblr rates its blogs on "Tumblarity" which is defined and quantified by how many reblogs, "likes", and followers a Tumblelog has. Comments aren't included with Tumblr—users often reblog with commentary or simply click an icon at the bottom of a post to indicate that he or she approves of the post's content. (Think of it like Facebook's "like" feature.)
Tumblr's network hosts nearly 700 million blog entries from its 5 million publishers. More than 500,000 new posts were written on the day this article was drafted, with many more yet to publish.
We'll join the masses next week.
Tumblarity: Tumblr Blogging Site Becomes Popularity Contest, Mashable
Tumblr Makes Blogging Blissfully Easy, The New York Times
What the Hell is Tumblr? And Other Worthwhile Questions, Fast Company