Out of curiosity which came first, side nav in Path or side nav in Facebook? I've been trying to figure it out for a while, or am I off base and someone else di

Out of curiosity which came first, side nav in Path or side nav in Facebook? I've been trying to figure it out for a while, or am I off base and someone else did it first and they just took it and ran? I think it's an interesting trend, definitely a good use of space. Slightly bored of just seeing black ones pop out so it's nice seeing people use it to fit in with the app theme or leverage additional content in there.