I've bought this extension and I'm very happy with it. It does what it says it does, works very nice and fast, the layout is very easy to work and is quick to implement with the automatic configuration. The manual configuration is terrible to configure, but is not associated with this extension but with the creation of apps and secret keys in facebook, linkedin and twitter. That is a bit of a nightmare for a non programmer, but this extension is a breeze to work. And with automatic configuration it does the job for us, just need passwords.
Also requested help with a tiny detail and the support was very fast and very helpful.