S/N is signal to noise ratio. imo negligible friction/trading costs coupled with instant information dissemination through social media have worsened the amplification issue of both signal and noise.
i have yet seen or read any credible argument that only signal gets propagated quickly whereas noise gets dampened and died out through social media. the reverse is more likely imo given the fact,well my observations mostly lol, that mr Mkt is very prone to herding and stampede.
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