Correct me if I'm wrong, but this doesn't say what Twitter moved to the cloud. It could be literally anything, and may not in fact be core tweet or user data.

This strikes me as a team (or teams) outgrowing the storage options that were offered internally and choosing to outsource to fit their needs. Isolated use for one business case, and not indicative of a broad movement to the cloud on the part of the whole org.

I could be wrong, of course.

I'd like to know more. And I'd certainly like to know what the engineers at Twitter think.