Hello,
Easysocial is not supporting webhook. And currently it is not in our roadmap to include this yet.
Having said that, it would best if you could submit your feature request regarding this simply by creating a new post in the Voices section so everyone else on the site could vote for it as well. In that post, you could include what kind of webhook you are looking forward to be implemented in Easysocial so that we have a clear picture of what customer really need.
The team will usually prioritize features that are in popular demand during the development process of the next major release.