Does the buzz die with Facebook until a Twitter IPO occurs? Believe it or not, there are plenty of exciting companies in Silicon Valley, and the ‘pipeline’ that feeds the IPO pipeline is certainly robust. A Yammer IPO looks like it could be a real event. Here’s what you need to know about this business social media company:

1. User base: Yammer already has 4 mn users – up from only 1.6 mn at the end of last year. And, the number of paid users surged from 200,000 to 800,000 YOY, according to Forbes.

2. Revenue: from 2010 to 2011, sales tripled at Yammer … always a good sign for a young company (and its venture capital investors).

3. Business model: Yammer uses a ‘freemium’ model – users get it free, and companies pay. It boasts a 20 percent conversion rate from free to paid.

4. The pitch: why use Yammer? The company touts its ‘security, reliability and integration with major existing enterprise software such as SAP’, reports Forbes.

5. Funding: Yammer has raised $142 mn so far, $85 mn of it coming in its most recent round. Its backers are: DFJ Growth, Social+Capital Partnership, Meritech Capital Partners, Capricorn Investment Group, the investment arm of Jeff Skoll, Khosla Ventures, CrunchFund, Charles River Ventures, Emergence Capital, Founders Fund and US Venture Partners.

Click here for FREE email alerts from Inside IPO >>

Source: Forbes

Photo: avlxyz via Flickr