One of the widgets you can use in your form is the "Social auto filler". This element allows the form fillers to pull data from their social media thus helping them fill in the form faster. It consists of links to 3 social networks: facebook, google+ and linked in.
This elements is located along with the other elements - inside the "Elements" panel under the "Widgets" category, in "Privacy".
You can simply drag it from there and drop it anywhere in your form, however it is recommended to place it at the top of the form since it should be used by the form filler before he starts to fill in the form.
