Syncmatic Segments on Facebook

This is a great app for syncing audiences from Shopify to Facebook. It's dead simple to use and also provides complete flexibility in defining customer segments using any combination of RFM values and this data is downloadable for analysis or to target in other channels (email, sms etc.). Furthermore, the developer is extremely responsive and receptive to questions and feedback, even going so far as to implement new features requested in rapid iteration. The app and support has definitely exceeded my expectations.