[cobralibre]

No, he's saying the opposite. He's pointing out that most online communications channels haven't solved the problem of filtering your output to specific audiences as you deem appropriate. For any single service, you're generally either communicating one-to-one or one-to-everybody, with no options inbetween.

This is a problem that is more easily managed in "real life" by the obvious limitations of presence.

[wccrawford]

And easily managed on the web by having multiple twitter accounts or email lists.

I really don't see the issue, and I think that's why nobody has done anything about it.

[wolfrom]

One big issue for me is that I only have one name. I think it's asking too much of people trying to connect with me to have to choose between four Twitter accounts or 2-3 Facebook profiles.

[sp332]

I can't keep FaceBook (or most other social sites) in two tabs, each in a different account. As soon as you log in with the second account, refreshing the first tab will send you to the second account as well.

Most sites just don't support multiple logins.