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This free Mac app may or may not feed your Facebook addiction.
Get notified of new Gmail messages and gain quick access to your inbox with free Mac app MailTab.
For quick access to the mobile Twitter client on your Mac, install the free and amusingly titled BirdDrop app to place a Twitter icon in the menu bar.
Writer 2.0 is really easy to learn and use. But on the collaboration front, it's no Google Docs.