  Unlike F(R) gravity, pure metric F(T) gravity in the vacuum dominated era,
ends up with an imaginary action and is therefore not feasible. This eerie
situation may only be circumvented by associating a scalar field, which can
also drive inflation in the very early universe. We show that, despite diverse
claims, F(T) theory admits Noether symmetry only in the pressure-less dust era
in the form F(T) proportional to the nth power of T, n being odd integers. A
suitable form of F(T), admitting a viable Friedmann-like radiation dominated
era, together with early deceleration and late-time accelerated expansion in
the pressure-less dust era, has been proposed.
