As Facebook is one of the major players and MessageMe is a new kid on the block, you would expect that the latter would be intimidated, if not crushed, by any direct attack from the social giant. In this case, it doesn't seem to be so. Despite Facebook recently cutting off MessageMe's access to the Facebook Friend Graph, the newcomer has since grown in popularity and managed to raise $1.9 million.
gRPC is an alternative architectural pattern to REST and GraphQL for providing and consuming APIs. It's becoming a popular way among many companies to create APIs intended to run at web-scale compared to the other architectures that often rely on data formatting standards such as JSON or XML.