Here is a survey of three books reflecting on the nature/nurture debate.
This link will take you to “New Scientist” article on human nature, which may be useful in discussions of ‘belonging’. You may also want to have a look here:
http://www.guardian.co.uk/technology/2012/apr/19/online-identity-authenticity-anonymity?cat=technology&type=article
where you will find a reflection on the notion of “authenticity” in the construction of online identities.
and, in a more trivial way, how we create the impression of one:
http://medicalxpress.com/news/2012-03-facebook-profile-iq-job.html