  We extract Transit Timing Variation (TTV) signals for 12 pairs of transiting
planet candidates that are near first-order Mean Motion Resonances (MMR), using
publicly available Kepler light curves (Q0-Q14). These pairs show significant
sinusoidal TTVs with theoretically predicted periods, which demonstrate these
planet candidates are orbiting and interacting in the same system. Although
individual masses cannot be accurately extracted based only on TTVs because of
the well known degeneracy between mass and eccentricity, TTV phases and
amplitudes can still place upper limits on the masses of the candidates,
confirming their planetary nature. Furthermore, the mass ratios of these planet
pairs can be relatively tight constrained using these TTVs. The planetary pair
in Kepler-82 (KOI-880) seems to have a particularly high mass ratio and density
ratio, which might indicate very different internal compositions of these two
planets. Some of these newly confirmed planets are also near MMR with other
candidates in the system, forming unique resonance chains, e.g., Kepler-80
(KOI-500).
