when zuckerberg comes, it is all over

nah, it would take a while untile facebook is ready for the blockchain, meanwhile others can take the lead

I don't think any giant company would want to go with blockchain at this moment. Regardless of how well established a company is, everyone has their own secrets which they don't wanna show to the world and we all know that the blockchain is transparent.
It would be like overhauling the whole Facebook platform if they integrate blockchain technology and I think it will be a huge task. Conversely, startup platform like REPU which will be developed from scratch has the big advantages with regards to integrating such technologies.