I think that Diggo could be a powerful collaboration tool in higher education classes because it allows teachers or students to highlight and annotate web pages without hassle. Teachers could use this tool to pull up webpages and share important points with the class.
RSS feeds make following news and blogs a painless activity. Teachers could require students to follow news stories or blogs to keep them informed on current events. Teachers could also use feeds to follow student homework postings without having to track down each individual post.
Wikis are powerful sources of information. If it exists, it's bound to have a wiki about it. Wikipedia is a well known (albeit controversial) source of most topics that you'd ever need to research. It has come under fire in the past for inaccurate information being posted. Wikis can't always be trusted because they are usually edited by the community.
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