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