In Italy more than a third of the population is on Facebook. If a user access the hotspot but is not yet on facebook, he will have the opportunity to join the social network in a few steps and then use the service.
Perhaps, 75% of users who actually use the Internet have a Facebook account.
Being this hotspot a marketing tool that uses social networks, if a user does not have a facebook account and do not want to have it, is not interesting for the marketing activities of the client.