"Network effects" cut both ways. I am interested in participating in the network that most of my peers are on, but I don't give a shit which network Ashton Kutcher, some C-list blogger or a random hashtag spammer is on. A non-twitter microblogging network could actually gain a lot of early momentum just by giving some thought to what it would take to make twitter suck less and then letting people know that this is not the service that Oprah or their mom will be on.