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You might want to look at Usenet, probably the oldest on-line community
dating back to the 70's. It originally started out as net.one-topic
net.another-topic. In the mid 80's it became so overwhelming large with
subdivisions an other scheme was developed where there are major groups
like "rec" for recreation, "sci" for science and so on. Within the
groups there are divisions and when a group becomes starts having much
traffic on a specialty area, then a proposal is make in the group for a
new group and a division is created.

While Usenet is not as active as it once was, it is still active. It
has been archived on Google for quite a while and there may be other
archives going back further. The groups are usually identified as
subgroups and the date of the first posting would be the date the group
was created.

-Don

>
>
>
> On Nov 4, 2005, at 4:15 AM, Emilie MARQUOIS-OGEZ wrote:
>
>> ***** To join INSNA, visit http://www.insna.org *****
>>
>> Hello everyone,
>>
>> I'm looking for examples of virtual communities that gave bearth to
>> other virtual communities. I mean that the members of one virtual
>> community (a mailing-list for instance) decided to have two virtual
>> communities instead of one. The first one is about a subject and the
>> second one is about another subject (linked to the first one, more
>> specific, for instance).
>
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