To enable their fren2fren™ transactions of course. Only wish I was joking.
To be fair, making people pay money to hurl abuse at you with /trolltoll is an interesting twist on the usual system where you just block them. Not sure why that needs a blockchain though.
No spam and micro transactions. Post costs 10 pens. Like 2 pens. etc...
You can yearn money if someone shares your content, likes, etc. Its all on blockchain. You own your twetch data and can move on any time
How would you solve those problems without a blockhain?