F.E.You could use services like ifttt to automatically forward posts from one social network to another. But that´s not ideal, Linky for macOS would be much better. Dev said on Twitter it´s not planned, unfortunately.
J. Christian Bernabe- Ops Director | Early Adopter | PolymathLove it. It optimizes a lot of no-brainer tasks for me and saves me time and mental energy. Recommend.