[Manishearth]

No, it's not, it's "mostly good enough for some scripts". This attitude just ends up making software that sucks for a subset of scripts.

Twitter is not a "basic case", it's a case where the length limit is arbitrary and the specifics don't matter much anymore. Usually when you want to segment text that is not the case.

Edit: basically, my problem with your original comment is that it helps spread the misinformation that a lot of these things are "just" emoji problems, so some folks tend to ignore them since they don't care about emoji that much, and real human languages suffer.