freemium 
socalTECH
JUNE 1, 2012
On average, not including our internal friends, every user who joins the site is inviting four new friends, and we haven't done any marketing except a press release. He put out a blog article and spreadsheet which outlined if you were going to be able to scale your sales team, or if something was not scalable.
InfoChachkie
MAY 22, 2012
Subscribe to their blog. Based on your research from Step 1, you should be able to communicate meaningful and insightful comments regarding the partners’ tweets, blog content, etc. If you are deploying a freemium business model, test your upsell strategy on a portion of your users to establish concrete free-to-paid conversion metrics.
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