The lack of a two-tiered relay structure, allowing for Public/Layer 1 and Private/Layer 2 relays, that are more or less porous and can be transversed. Public is more abstract/digital, but more global and universal and the guarantuer for censorship resistence. Private is more personal/analog, bound more my geography, topic, business, or personal connection.

The fact, twitter needs to produce higher income and is therefore pressured to sell views and attention.