If you have previously set up a filter you can reuse this filter to build your recipient list. 

Unlike sending to pre-loaded groups, building a list with a pre-loaded filter will dynamically include new leads/customers loaded since you set up the filter.  If you need to build your filter just select the types of leads you want to build your list to include using the provided filters.  For example if you just want Facebook leads, created this month that made it to Test Drive and were qualified to Ford Falcons you can do this. 

The Build List function give you much greater control over targeting your messages at specific customers.