It's true. Probably because Meebo tends against lock-in and everyone is obsessed with being the next company with lock-in and, therefore, Microsoft-like profits.
Twitter has users with accounts, histories, people they follow. Same with Facebook, MySpace, etc. Meebo can be "easily" replaced by a competitor. Easily in this case means, you don't have to transfer all your data nor do you need to get your friends to move services.
That's why we aren't as giddy about Meebo. They need to keep working really hard to stay one step ahead of the competition. As opposed to Twitter/Facebook/MySpace who have to work just hard enough that users won't take the effort to transfer data and bug their friends to switch to a competitor.
Twitter has users with accounts, histories, people they follow. Same with Facebook, MySpace, etc. Meebo can be "easily" replaced by a competitor. Easily in this case means, you don't have to transfer all your data nor do you need to get your friends to move services.
That's why we aren't as giddy about Meebo. They need to keep working really hard to stay one step ahead of the competition. As opposed to Twitter/Facebook/MySpace who have to work just hard enough that users won't take the effort to transfer data and bug their friends to switch to a competitor.