The whole point of their platform is that it's not controlled by any central authority and is resistant to censorship, control, breaches of privacy, etc. The fact that even some of the most horrific and undesirable content, that which people most adamantly wish to censor, CAN'T be censored, is a strong proof that their network works.
All they need to do to is say, "Censoring this is not possible", as they seem to be doing, and that promotes their software. They don't need to talk about, approve of, or even be aware of the horrific things that ISIS does. It's enough to know that people really, really don't like what they're posting.
On the other hand, by actively attempting to censor the content, as Diaspora also seems to be doing, they're also sending the message that they don't actually truly believe in openness as a value, deep down, even though they designed their software to provide it. That actually hurts them a bit in the long run, I think.
All they need to do to is say, "Censoring this is not possible", as they seem to be doing, and that promotes their software. They don't need to talk about, approve of, or even be aware of the horrific things that ISIS does. It's enough to know that people really, really don't like what they're posting.
On the other hand, by actively attempting to censor the content, as Diaspora also seems to be doing, they're also sending the message that they don't actually truly believe in openness as a value, deep down, even though they designed their software to provide it. That actually hurts them a bit in the long run, I think.