This is divided by a few different perspectives...
1. General reasons to use TechNet Wiki:
2. The person blogs, but they do not use TechNet Wiki:
3. The person uses TechNet/MSDN Forums but not TechNet Wiki:
4. The person uses TechNet/MSDN Gallery or CodePlex, but they do not use TechNet Wiki:
5. Full stories about using the Forums, Wiki, Gallery, and Blogs together with Social Synergy:
6. Other types of Social Synergy (using the Wiki and another social platform together):