Interesting factoids from Groove usage analysis aggregated across a very broad statistically significant anonymous sample set.  I did this in order to empirically validate some intuitions related to some UI design enhancements that I'm considering. 

The analysis does indeed validate that the 2-25 design center of the product is precisely the sweet spot of where it's being used in practice:  approximately 35% of shared spaces are between a single pair of individuals, 60% of shared spaces are between 3 and 25 individuals, and 5% of shared spaces have more than 25 individuals.  Amazingly to me – given the design center of the UI – I found that within this 5% there are actually hundreds of spaces with 100-250 members each; I'd surely never have expected this.

One other incredibly fascinating tidbit: 25% apparently use shared spaces with only themselves as a member, using Groove as a “briefcase” to transparently and securely synchronize files across multiple computers that they own – e.g. Office documents being synchronized between home and office PCs. [Ray Ozzie's Weblog]

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