IBM gets wikis. In a 300,000+ person enterprise, a wiki enables emergent collaboration and expertise:

BluePedia is an encyclopedia of general knowledge about IBM, co-authored by IBMers for IBMers, which enables the collection of expertise and know-how of more than 300,000 IBMers around the world into a simple, searchable resource that is easily expanded, shared and used. The single, global co-authoring platform enables the development and implementation of a common worldwide vocabulary and easy recognition and identification of subject matter experts.