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Now you might be asking: Wasn't there already a third-party Chrome extension that did this? Yes, but this official Facebook one's better, showing you how many others have clicked Like on the page you're viewing.
We tried it, and the extension installs in seconds. It immediately works well, making short work of showing all your Facebook pals what you like, no matter where you roam on the Interwebs. It shows up alongside all the other extension buttons and also lets you access its Likeatude in Chrome's right-click menu.