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The LAT instrument, onboard the Fermi satellite, in its first three months ofoperation detected more than 100 blazars at more than the 10 sigma level. Thisis already a great improvement with respect to its predecessor, the instrumentEGRET onboard the Compton Gamma Ray Observatory. Observationally, the newdetections follow and confirm the so-called blazar sequence, relating thebolometric observed non-thermal luminosity to the overall shape of the spectalenergy distribution. We have studied the general physical properties of allthese bright Fermi blazars, and found that their jets are matter dominated,carrying a large total power that correlates with the luminosity of theiraccretion disks. We suggest that the division of blazars into the twosubclasses of broad line emitting objects (Flat Spectrum Radio Quasars) andline-less BL Lacs is a consequence of a rather drastic change of the accretionmode, becoming radiatively inefficient below a critical value of the accretionrate, corresponding to a disk luminosity of ~1 per cent of the Eddington one.The reduction of the ionizing photons below this limit implies that the broadline clouds, even if present, cannot produce significant broad lines, and theobject becomes a BL Lac.

The blazar's divide and the properties of Fermi blazars