Have you ever heard a song and not really thought much of it but as it plays again and again on the radio you find yourself humming along and actually enjoying it? In fact the more you hear it the more you like it? That is an example of the mere exposure effect. The more you are exposed to something the more you like it. Now do not get me wrong - the song needs to be good enough - if it is annoying it could have the opposite effect!
What is true of songs is true of us too when it comes to business development. If you are present in the world of your clients and prospects - and that presence is useful, helpful and not annoying - it can result in very positive business outcomes.
So being present online with timely, client relevant, helpful, digestible content works and the reason is partly - The mere exposure effect.