Acknowledging to a Facebook user that you know they’ve visited your website, together with a relevant message, can be a highly-targeted way of getting mid-funnel users to complete the final steps to conversion.
Who's done it well
See who’s doing this well in travel.
Sometimes, the direct approach can be effective in getting people to re-engage. Don’t be afraid to remind past visitors that they’ve been on your site and have engaged with specific triggers, such as destination pages.