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For the first time, a phenomenological analysis of the experimentalelectromagnetic form factors of the nucleon, both in the timelike and spacelikeregions, is performed by taking into account the effects of nonvalencecomponents in the nucleon state, within a light-front framework. Our model,based on suitable Ansatzes for the nucleon Bethe-Salpeter amplitude and amicroscopic version of the well-known Vector Meson Dominance model, has onlyfour free parameters (determined by the spacelike data with $\chi^2/datum \sim1.7$), and yields a nice description of the experimental electromagnetic formfactors in the physical region in the range $-30 (GeV/c)^2 < q^2 < 20(GeV/c)^2$, except for the neutron one in the timelike region. Valuableinformation can be gained in the timelike region on possible missing VectorMesons around $q^2 \sim 4.5 (GeV/c)^2$ and $q^2 \sim 8.0 (GeV/c)^2$

Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models