From Wikipedia: A blog (a contraction of the term " web log ")  is a type of website , usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. A wiki ( / ˈwɪki / WIK-ee ) is a website that allows the easy  creation and editing of any number of interlinked web pages via a web browser
Blogs and Wikis are excellent environments for Project-Based Learning. They encourage the 4 Cs: Critical thinking, Communication, collaboration and creativity. Pick a blog or wiki tool of your choice and create your account! Here are some suggestions: Blogs – blogger.com, wordpress.com, typepad.com,livejournal.com and tumblr.com. Wikis – wikispaces.com and wetpaint.com
Maximizing Speaking using Blogs and Wikis The students may aim to arrive at a conclusion when choosing the theme for the blog or wiki , share ideas about possible widgets or features, or find solutions in their discussion groups. Before the discussion, it is essential that the purpose of the discussion activity is set by the teacher. In this way, the discussion points are relevant to this purpose.
http://www.englishteacherwaltermiranda.blogspot.com/ Professor Walter Miranda - Sudoeste Golden Blogs http://www.expressplus2cultura.blogspot.com/ Rachel Coimbra – Asa Sul