I need to build a smile user script that can be installed into Chrome, Firefox and other modern browsers.
* Clicking on the specific button on the keyboard (e.g. Pause/Break) user should see a popup where he can like and share article in the social media networks. By default user script should share this article in the FaceBook.
* Holding the same button user should see an animated popup (should look like the windows switcher in MacOS/Ubuntu) where he can select other social network site by clicking same button once (left/right/enter/esc buttons and mouse clicks should be also supported). After a short delay of time sharing should proceed into selected social network.
* (IMPORTANT!) If user is logged in into the social network, posting should be done immediately, without any additional steps or actions required from the user.
* User should be able to configure default Social network.
* User should be able to configure the key on the keyboard which is triggering the sharing.
* Right now user script should support Facebook, Google Plus, Twitter, VK.
* Script should not store any user password anywhere.
* Should work good in any modern browser in Windows/Linux/MacOS.
* Make your code clean.
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