If it were truly useful, it would have generated its own promotion. It'd be more like the early years of Firefox, where the benefits it provides are so overwhel

If it were truly useful, it would have generated its own promotion. It'd be more like the early years of Firefox, where the benefits it provides are so overwhelming that the early adopters are very willing to spread the word and get others to use it. But Persona clearly isn't that useful to enough people. Even those who've known about it for a long time now just haven't found it practical enough to try to get others to use it.