Yeah sorry that is a take all or take none solution. You are looking for a friend feature in a service that is meant for micro-blogging. – phwd♦Apr 6 '11 at 9:47
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Consider using different accounts (e.g. one for business, one for personal) – phwd♦Apr 6 '11 at 10:02
@phwd: I ended up following your advice and using one public account + one private account. I ban friends who try to subscribe to my public account, and add them to the private one. Works fine. – Nicolas RaoulFeb 21 '12 at 13:23