Meta is courting the risk of going full Orkut, where people come by to check out early hype on an unfinished product, find the feature set underwhelming, and head off elsewhere. The tradeoff with getting tens of millions of users at launch is that it will be harder to get a disappointed user to come back and try again than it was to get them to try the first time.

I'm sure for the dev team this is a busy time, and the work they need to do to accommodate so many new users creates a feeling of forward progress. But none of that work (from what I'm seeing in discussions) seems to involve adding basic functionality, while in the interim people are forming a durable first impression of the service.