Mmm it's not only "telemetry data". It's that (e.g. Scuba) and other types of logs, and not only Facebook (e.g. Instagram as well).
Basically, everything that needs logging and post-processing by both real-time systems (e.g. Puma) and batch processing (e.g. all of the data that's ingested and sent to the data warehouse) goes through Scribe.