Tumblr is a free and very easy tool for creating tumblelogs. While blogs are considered to be journals, tumblelogs are scrapbooks. While blogs are designed to handle text posts mainly, tumblelogs let you easily and quickly post and share anything you find on the web or create yourself. Tumblelogs includes various post options like text, photo, quotes, links, audio, video and dialogs.
What Wikipedia says about tumblelog:
A tumblelog or tlog is a variation of a blog, that favors short-form, mixed-media posts over the longer editorial posts frequently associated with blogging. Common post formats found on tumblelogs include links, photos, quotes, dialogs, and video. Unlike blogs, this format is frequently used to share the author’s creations, discoveries, or experiences without providing a commentary.
Tumblr has an extremely easy and intuitive user interface to help you share the web content. You can write your text, post quotes and dialogs, upload photos to tumblr or use the photo URL from hosted photo websites like Flickr, embed a video from Google Videos or youTube. You can’t upload a video to Tumblr though.
Sign-up is very easy. Just type your email address (login name), password and select the tumblr url and you are all set to start posting. Tumblr provides variety of templates to choose from. The templates define how each type of post will be displayed in your tumblr website.
You can post anything to tumblr. You don’t need to know any HTML or CSS. You can create channels and invite your friends. Using the channels, you can publish anything for your family, friends, tech group, etc. and provide separate RSS feeds for them to follow. So tumblr is all-in-one scrapping. You also have the option to make each of your posts private.
You can also import feeds from other sites like twitter or Flickr into Tumblr. You can post pictures and text from your mobile phone by sending that email to your private email id provided by tumblr.
The tumblr pages do not have comment capability as you are used to in blog services. So you can’t get any feedback from your reader community. Tumblr is almost like a personal space for you and your friends can follow your posts like in Twitter.
Tumblr applies the formating to your various posts to give different user interface. Tumblr provides a bookmarklet using which you can easily add any post type to your tumblr. Moreover, you can own a custom domain name and publish your posts using Tumblr. It’s very easy to setup.