[cozzyd]

Nothing is faster than C in a vacuum, but depending on the context (medium?) that can happen.

In other words, someone should name a language Cerenkov

[oneshtein]

Gravitation is slightly faster than c in vacuum.

[hyperbrainer]

In GR, the speed of gravitational waves is _exactly equal_ to c.

[oneshtein]

In reality, speed of light is slightly lower than speed of gravitation, because gravitation slows down speed of light.

[hyperbrainer]

We were presumably talking about an ideal massless space [Minkowski] in which the speed of light in a vaccuum is considered -- that is what c is defined as.