Bitcoin has a decentralized ledger where all transactions are stored. How would that ledger look for a decentralized Youtube or Facebook?

Or am I missing something? Does decentralization mean something different in this regard?

diaspora* is completely different from most networks that you use. It is completely decentralized, with no central “hub”. Even so, it’s very easy to connect and communicate with people. Here’s how.

diaspora* is a true network, with no central base. There are servers (called “pods”) all over the world, each containing the data of those users who have chosen to register with it. These pods communicate with each other seamlessly, so that you can register with any pod and communicate freely with your contacts, wherever they are on the network.

Most social networks are run from centralized servers owned and run by a corporation. These store all the private data of their users. This information can be lost or hacked, and like any system with a bottleneck, any problem at the central servers can make the whole network run very slowly, or not at all. It is also more easy for governments to “listen in.”