Yep, using is believing. Most of the time at least. Try to explain someone why he/she should buy an iPad. Or should use Twitter. Or Google+. It's not very easy (but some are really good at it). Sometimes it's even frustrating, when your audience scrutinizes every sentence trying to describe the affordance of a tool. It's even one of the things I catch myself thinking when I give social media strategy workshops. 'They should just start doing it (in a smart way)'.
In the meantime, this doesn't keep me from talking, blogging, demoing to trigger people. Just like the first link in this post triggered me to write this post!