There’s simple apps that don’t do a lot, but do what they do well. Then there’s Yo, as the FT points out, which takes the minimalist concept the extra mile. In a nutshell, ‘Yo’ sells itself as a single-button, “zero-character communication tool.” Rather than saying ‘Good Morning’ to your buddies, you simply ‘Yo’ them. That’s it. Available for Android and iOS, ‘Yo’ requires no email address, or no annoying signing-up process via Facebook – just choose your username, invite friends to join, and you can ‘Yo’ each other all day long by tapping a button. ___ A bit of a...

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