I don't specify the recipients when I send an email to a mailing list. It goes to whoever is subscribed to the list, similar to how twitter messages go to the users who are following the person sending (or how it would go to a "group" in Yammer).
Then you might say, "But there is also a public feed of all the tweets" to which I would reply, "There are plenty of public interfaces to mailing lists". Gmane is essentially twitter if everyone used tags and tweets were actually given context in the larger conversations they create. And there was a lot less worthless noise.
There is nothing new here. Basically, Twitter just took away the ability to specify a group of recipients when sending an email, limited the character count, removed file attachments, etc.; Yammer put those features back. I hope Yammer becomes super popular because eventually someone else will then notice, hey, we're essentially using email again!
Then you might say, "But there is also a public feed of all the tweets" to which I would reply, "There are plenty of public interfaces to mailing lists". Gmane is essentially twitter if everyone used tags and tweets were actually given context in the larger conversations they create. And there was a lot less worthless noise.
There is nothing new here. Basically, Twitter just took away the ability to specify a group of recipients when sending an email, limited the character count, removed file attachments, etc.; Yammer put those features back. I hope Yammer becomes super popular because eventually someone else will then notice, hey, we're essentially using email again!