@Remittancegirl I recall a study done in the early days of online activism that showed that people who were highly vocal online were not always quite so dependable in the flesh. The hypothesis was that people who feel like they've done their part by speaking feel like they've partially fulfilled their intent and are less motivated to get their hands dirty.
I've always taken that finding to heart and valued actions before words and similarly support people who are doing acts even if they're not saying things that validate my belief system.