&gt; <i>You start by saying that Facebook is not a competitor, but in taking over part of your core business--- keeping track of potential customers--- it could be seen as that.</i><p>If keeping track of lists of potential customers is such an integral part of your core business that someone else doing it is &quot;competition&quot;, then it can be plausibly argued that you&#x27;re in the spam business, at least to some degree.