Why tickets from Facebook don't show immediately in Support?

Question

When my customers post on a Facebook page linked with a Zendesk account, there is a delay of several minutes between the post and the ticket it creates. Why is this the case?

Answer 

The process to create tickets from Facebook pages is done by polling the Facebook API to find all new posts since the last poll time. This polling typically happens every two minutes but it may take longer in certain situations dependent upon when the Facebook API returns that post or message in question.