Yammer came to the market with one of the first microblogging services. In the span of their existence, a number of companies launched their own versions of an activity stream. But Yammer looks like they have the customers to prove they have a hold on their sector of the market.
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At today's Enterprise 2.0 conference, Yammer announced that 50,000 networks have been established with its service. We asked Yammer's Steve Apfelberg what the size of these networks look like. He said they run from a few people to a few thousand, with the average about 25 to 50 people per network. He declined to provide details about the number of paying clients but said they are showing revenues. But if you did the math, it could be extrapolated that Yammer has 1.25 to 2.5 million customers. Hoe many of those are paying for the Yammer service?
You look around the Enterprise 2.0 conference and it becomes apparent that microblogging is the hot feature for companies on the exhibit floor.
A few of these companies started as wiki providers. They added microblogging, which helped di