Twitter and Yammer Test Dot-com Business Models
nytimes.com
nytimes.com
Does this still hold in the current post sub-prime credit squeeze?
"... Yammer, a new and much smaller copycat aimed at corporate customers, has a mere 60,000 users ... Just six weeks after its public debut, Yammer is already bringing in a modest amount of cash ..."
Note that Yammer really didn't have to invent the idea. Just sit, notice Twitter was on to something then build something derivative with a specific niche in mind - a Twitter hybrid. Steve Bowbrick mentions the BBC uses Yammer ~ http://commonplatform.co.uk/index.php/2008/10/15/huggers-yam... So Yammer is going for a profitable niche.
What is Twitters niche?
[Update: Further down it says, "though only 200 companies with 4,000 users are paying so far." That seems more realistic in terms of paying customers :)]
By the way, I am thinking about implementing a similar model for my soon-to-launch Twitter for the homeless (incl free iPhones).