Propaganda is asymmetric, it takes more energy to communicate and rebut with Truth than it does to fabricate lies. Truth requires precision, clarity and subtlety; lies are a dead-blow hammer.
The channel capacity is full of false. So responding takes more than one tweet of true. The medium of twitter makes it hard to rebut anything but the most simple statements.
No, "conversations" on twitter are a reflection of the platform's limited ability to convey the nuance and subtle nature of truth in contexts that matter.