A wiki is a website or similar online resource which allows users to add and edit content collectively. Everyone that visits a wiki can add content to it without having to log into an account.
Blog is short for weblog. A weblog is a journal (or newsletter) that is frequently updated and intended for general public consumption. Blogs generally represent the personality of the author or the Web site. Blogs are now popular for business use as well.
I registered with JotSpot today. I received a URL : http://dylanwan.jot.com