By now you've heard of Yammer, but have you heard of Igloo Software? Possibly the best kept secret in enterprise social networking, Igloo combines file sharing, microblogging and a host of other collaboration tools in a single sweep. We power communities for small and mid-sized businesses, including Harry Winston and the ATP World Tour, and even scale up to support larger enterprises. Here's what you need to know about this cloud collaboration company:

1. User Base: Igloo has over 4,000 global collaboration sites in over 80 countries around the world and well over 500,000 paid users.

2. Revenue: From 2010 to 2011, Igloo's monthly recurring revenue grew 144%, a clear indicator of success for Software as a Service (SaaS) businesses.

3. Business Model: For less than it costs to create a premium network on Yammer or a business account with Box and for a fraction of the total cost of ownership of a SharePoint or Jive, you can build a full-fledged social intranet, partner portal or customer community. It's a complete social collaboration solution that makes the simple stuff easy, and the complex stuff possible.

4. The Pitch: Igloo is your digital workplace in the cloud, bringing together content and conversation in one unified environment that doesn't have to be managed by IT.

5. Funding: Igloo has raised $9M to-date in venture capital funding, $5M of which came in its Series B round at the beginning of this year. It is backed by RBC Ventures, the technology venture capital arm of RBC Royal Bank, Ontario Emerging Technologies Fund and a private investor.

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