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Re:The Not-So-Universal Language of Laughter by CatsoCatsoCatso on Monday August 10, 2015 @04:24AM (#10033330)
It doesn't say whether Private Messages were analysed, assuming not.

What's frustrating about PMs at the moment on FB is that only on the mobile apps is it easy to use emojis. The smiley-face link on the messenger.com interface & the facebook.com domains only provide a choice of "stickers" (which are awful). So unless you know the keyboard shortcuts off-heart you're stuck using plaintext.

Re:The Not-So-Universal Language of Laughter by QuantumRoar on Monday August 10, 2015 @09:20AM (#10034354)
It does say this as a footnote:

   "We limit this study to posts and comments and do not look at direct messages through Messenger."