"remains our primary channel for communicating with the public," backed by "LinkedIn, YouTube, RSS feeds, podcasts and videos as well as traditional print and phone channels," writes Vanguard Group spokeswoman Linda Wolahan. "We are considering using Twitter."

Well, who doesn't? But Wolahan adds that Vanguard's "social media team" is going beyond where a lot of highly-regulated investment and banking firms have gone so far:  "Blogs and Facebook are rare among financial firms because of stringent regulatory rules about what can and cannot be posted." Vanguard's gone ahead and taken the plunge, using "strict criteria about the kind of comments that get posted."

Vanguad's blog:

Vanguard on Facebook:

Vanguard on YouTube: