Co-founded in 2004 by Eric Ries (the author of The Lean Startup and creator of the concept), IMVU was one of the first successful lean startups. It is a large virtual 3D chat environment where you can dress up an avatar, create a home page for it, and talk with new people online. The original product the company made did not contain these features, however. The product evolved through the lean startup process to become what it is today.
Minimum Viable Product is a term that is often used in business and marketing but it is not usually clearly defined because it's not that easy to "get". When you understand how powerful the idea is, you'll understand why minimum viable product matters.
It seems like every second client I talk to at the moment is sick of their current CRM (customer relationship management) software and looking for a new one. Many of the folks we talk to run non-profit organisations, which makes it a little trickier to track down the right choice of CRM.