What do the different iPhone audio sounds mean?

In the iPhone audio sound settings, there are different categories for which you can assign a different sound. E. G. Ringtone, text tone, new voicemail, calendar alerts, and tweet. What is the tweet option? I would assume for twitter accounts, but whenever I tweet something or receive a twitter notification it does not make the sound I have assigned to that function, in fact it makes a totally different sound, one that's not even selected. Anyway, I was just wondering if anybody knew how that "tweet" audio sound function worked.

I don't know about this type of audio setting.

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