The vibe of Twitter seems to have changed: a surprising number of people now seem to tweet about how much they want to be free from encumbrances like Twitter.
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My opinion is that for the next 5 or so years we will continue to focus on acquiring more and more people as “connections” on facebook, twitter, myspace, etc. Then we will realize that we don’t care about 90% of the people to whom we are connected, which will cause us to pare down our lists to very close family and friends.