[obstinate]

Make a header file for your project that exports the Facebook headers and typedefs the names to something that makes sense. I like source and sink. Producer and consumer are fine too. Emitter and receiver are fine as well. And writer/reader. If you do this, then you only have to make sense of which side is which once, then forever after you'll have sensible names for the things (at least in your project).

The important thing is to always treat the name the same. Generally, I treat types as nouns. So an emitter is something that emits something. It's passed to the routine that consumes the data. On the other hand, a consumer consumes, so it's passed to a routine that emits something for consumption.