Filter by number of contacts in a list
A filter that could read the number of contacts in a list would be useful for:
* managing event attendance - for example by creating workflows with if/then branches that send different emails depending on how many contacts have filled a form
* managing how many contacts can a HubSpot user own
* sending "milestone" notifications - eg "Hey, we have reached x subscribers for this event so far..."
Please comment with other potential use cases !