[minimaxir]

The question is whether using Yo is more practical than using a Timer app, which is native to every smartphone released in the past 5 years.

It isn't.

[icebraining]

It might be, if you can't remember how many minutes it should be. I have to admit I always have to look it up,

[jaredsohn]

One could also build the same functionality into a Twitter account fairly easily.