I've thought about this, too. All the chat and social network tools are constantly shifting their UIs and naturally, I guess, trying to highlight new features,

I've thought about this, too. All the chat and social network tools are constantly shifting their UIs and naturally, I guess, trying to highlight new features, which on a tiny phone screen is equivalent to making them easy to accidentally click. The worst I've done is accidentally send a Facebook "thumbs up" in an inappropriate context, but it's easy to imagine how you could do much worse.