It depends what is the subject. Crypto come to mind. People having interest in it have flooded every available public space, and not only online : Search eng

It depends what is the subject. Crypto come to mind. People having interest in it have flooded every available public space, and not only online : Search engines ('coin something' websites), /r/bitcoin, /r/cryptocurrency and so on, youtube at large, online media outlets, online financial newspapers, amazon, physical bookstores, paper business magazines, business tv, and so on.