I have the opportunity to say where my Open Source involvement is, at work and at tech meetup events. When I say "Dreamwidth" I mostly get blank looks; maybe 1 time out of 100 or 200 I get a delighted "ooo Dreamwidth!" or a "Oh huh, are they still around?"; when I say "a code fork of LiveJournal" I get variations on "Man, I used to have a LiveJournal..." about 95% of the time. Sometimes they recognize Dreamwidth if I mention that it's one of the few open source projects which are majority women. So off the cuff I would not say that it is well known outside of certain fannish circles, which do not line up with Silly Valley dev circles in the way they may have some time ago.