I've generally used the term "drip irrigation" to describe the process of nurturing relationships over time. You make a point of "dripping" a little bit over a long time and eventually, your network/prospect/client gets the full picture.

Well, my friend, Debbie Weil has a better analogy. She calls them 'digital cupcakes.'

I think it's a more appealing visual and accurately summarizes what we all need to be doing.