[UserRights]

How big will the blockchain become? I have not read much about Ethereum and not a deep understanding of every technical aspect regarding blockchains, however I understand that most applications just are not practical with endlessly growing blockchains. Does Ethereum a solution for that?

[Quiark]

They are calling this the 'scalability problem' and are researching it as well. I think the general idea is to divide the blockchain into shards with some links in between.

[imglorp]

One needn't store the data on blockchains, just a hash to it, or even a hash of many data blocks' hashes, etc.

[pjc50]

Well, someone has to store and transmit the actual content at some point, and for real twitter there's a total volume of 400 million tweets a day...