To bring the power of blockchains to mainstream internet applications which are data-heavy, we need to shift from the current paradigm of general-purpose blockchains to application-specific blockchains.
Putting social media on blockchain increases the control of network particiants like creators, users, advertisers, developers and moderators. That's why we put social media on blockchain.
While the last couple of cycles have seen the dominance of General Purpose Blockchains like Eth, DeSo is starting the paradigm of application specific blockchains