Most of those writes don't need to be serialized transactions. Other p2p data structures like CRDTs and torrents are sufficient for posting comments and uploadi

Most of those writes don't need to be serialized transactions. Other p2p data structures like CRDTs and torrents are sufficient for posting comments and uploading photos; see the decentralized social network Patchwork[1] (based on scuttlebutt[2]). The blockchain itself will only be needed for certain types of transactions, for instance those around identity (e.g. name registration), and reputation/spam prevention (forum moderators). 1. https://github.com/ssbc/patchwork https://github.com/ssbc/patchwork 2. https://github.com/dominictarr/scuttlebutt https://github.com/dominictarr/scuttlebutt