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Definition: Yng nghyd-destun ystadegau defnydd gwefannau, un enghraifft o hysbyseb a gaiff ei gweini i sgrin defnyddiwr. Yng nghyd-destun Twitter, mae'r diffiniad ychydig yn wahanol; bryd hynny mae'n golygu trydariad sy'n ysgogi rhyngweithiad neu ymateb gan eraill.
