Islamic State: a genuine caliphate?

Geopolitis (13.09.14)
Mallory Schneuwly Purdie, Institute for the Social Sciences of Contemporary Religions at UNIL. On June 29, 2014, the hitherto little-known Abu Bakr al-Baghdadi proclaimed himself Caliph, i.e. successor to the Prophet. What exactly is this caliphate/Islamic state?