You collect the mood of social platforms (X, Reddit, Truth Social, Telegram) around topics tied to specific markets, score whether the chatter is turning bullish or bearish, and trade when that sentiment clearly disagrees with the current market price. The bet is that a real shift in public opinion shows up in posts before it shows up fully in the price. Spam and bot filtering matter a lot, since fake activity can fake out the signal.
Markets on Polymarket where social sentiment signal is the natural play: