Franz I am pretty certain I'll have bad dreams tonight... about people following me with microphones, asking to pronounce "Flarum". The video on the original Kickstarter page may be a nice source here...
ameo I'm from country when it's usually pronounced as it's written. FLARUM. But as i hear now, it's more like flaerum, which is ok for english speakers, but not for me.
xyweasel I pronounce it as /ˈflɐːɹəm/ but, after watching the Kickstarter video, I'm evidently wrong. But, I'm wrong about how I pronounce gif, so I'll just keep doing what I usually do.
Prosperous I didn't even notice that video! I knew the pronunciation of Flarum as soon as I saw the word for the first time, but esoTalk I pronounced differently. At first I pronounced it as eee-soTalk instead of eh-zoTalk.