The Libra Association will oversee Libra Blockchain and manage Libra's reserve to assure the stability of the cyptocurrency's value.
The organization is composed of founding companies of the cryptocurrency, each of which contributed about $10 million. According to the Financial Times, members include PayPal, Vodafone, Lyft, Uber, Mastercard, Visa, and Spotify — the association does not include Amazon, Google, Apple, or any banks.
The Libra Association is meant to be an independent non-profit, and Zuckerberg and Facebook won't have any more voting power in the organization than any other company. However, Calibra's "Customer Commitment" outlines the following:
"Facebook teams played a key role in the creation of the Libra Association and the Libra Blockchain, working with the other Founding Members. While final decision-making authority rests with the association, Facebook is expected to maintain a leadership role through 2019 ... Once the Libra network launches, Facebook, and its affiliates, will have the same commitments, privileges, and financial obligations as any other Founding Member. As one member among many, Facebook's role in governance of the association will be equal to that of its peers."
Facebook is similarly involved with Libra itself. Facebook may be excluding itself from Libra's marketing — the Libra website doesn't mention Facebook, and it has different branding than Facebook or its other subsidiaries — but its engineers are contributing significantly to the cryptocurrency's open-source codebase.