Andreessen says that the Yo app is a form of one-bit communication – a message with no content other than the fact that it exists, such as a police siren, flashing stop light or taxicab roof indicator. He notes that missed calls are another form of one-bit communication and in Bangladesh account for as much as 70% of mobile network traffic at any one time, used as a prearranged signal or code:

7/So the hilarity around Yo includes two problematic biases: Bias that one-bit comm isn't useful, and bias that all markets are like the US.

— Marc Andreessen (@pmarca) June 19, 2014