If you haven’t already, turn on the Social app from the Apps panel. Instructions can be found here. Then, click the “Social” app button on the OneLaunch dock.
OneLaunch's Social app provides quick access to the most popular social media websites with just one click! Simply hover your mouse over your favorite social media website and click the pin to add a shortcut to the OneLaunch dock. Click the shortcut anytime to immediately open the website in your browser!