A transport arrangement and networking system can receive pick-up requests from user devices of requesting users. The pick-up requests can include a carpool service preference. The system can transmit an invitation to a driver device of a proximate carpool driver to service each received pick-up request and identify carpool riders riding with each requesting user. The system can further access social media data for the requesting user and the carpool riders. When the accessed social media data indicates a common link between the requesting user and the carpool rider(s) the system can generate and transmit a notification to the requesting user indicating the common link.