Jetpack filter hook for publicize post

I would like to know whether is there any filter hook in jetpack plugin which gets called before post get published on twitter through jetpack using publicize feature.

I browsed many times, but I failed to find so. So any help on this is appreciated. I found this feature mentioned in http://ift.tt/1OOuLRw , but I couldn't find that filter hook over here http://ift.tt/1SJnNRM

Any help on this is appreciated

via Chebli Mohamed