[allwein]

>Usability wise, it makes a lot more sense to have "enter" be a new line.

I disagree. The paradigm they're using here isn't that of word processing a document, but rather quick text conversations. In pretty much every chat/IM program I've ever used, "enter" == "send", and shift+enter == newline.

[tuhin]

Exactly! Dow you want the conversations to be one liners (witty or shallow) OR do you want people to have meaningful conversations?

Assumption: You cannot always have meaningful conversation with one liners.