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We briefly summarize the status with electromagnetic nucleon form factors,and give in this framework, arguments to study the angular dependence of thedifferential cross section and single-spin polarization phenomena (polarizedtarget or polarized beam) in $\bar{p}+{p}\to \ell^++\ell^-$, in view of theavailability of future antiproton beams.

New possibility for further measurements of nucleon form factors at  large momentum transfer in time-like region: $\bar{p}+{p}\to \ell^+ +\ell^-$,  $\ell=e$ or $\mu$