Blogs vs. Wikis

The key difference is that wikis can be used for collaboration, while blogs are typically one-way communications. Of course, in practice, things are not quite this clear cut.

Blogs most often have an option for readers to leave comments, which can form a kind of multiple-level communication where the blogger and readers leave various replies to comments, creating a discussion string ( blogoshere ping pong, if you will). Blogs can also be linked together, creating a community of bloggers, sharing ideas and opinions.

Wikis, which are very useful for collaboration because people are empowered to add to and edit the work of others, can also be set up without permissions for outside users, in which case they act like crude websites, in that they are one-way and can have multiple pages and sub-pages.