Are you conflating a call to action on a channel you already control with advertising? Because in that case you might try f(A), f(A,B) and also f(B): could be a

Are you conflating a call to action on a channel you already control with advertising? Because in that case you might try f(A), f(A,B) and also f(B): could be a synergistic effect, or they could just click on anything.