Use your social media and other Internet accounts
You can use Facebook, Twitter, LinkedIn, and other social media accounts in Mac apps by adding the accounts to your Mac. For example, you can share photos, webpages, notes, and more to social media from apps like Photos, Safari, and Notes. Likewise, you can add Exchange, Google, Yahoo!, and other Internet accounts you want to use with Mail, Contacts, Calendar, Reminders, Notes, and Messages.
You can add social media and Internet accounts, and manage account settings, in Internet Accounts preferences. You can also add Internet accounts from some apps that use them.
An iCloud account you add using iCloud preferences also appears in Internet Accounts preferences. You can change its settings in either place.
Add an account from an app
You can add accounts from Mail, Contacts, Calendar, Reminders, and Messages. Accounts you add from the apps appear in Internet Accounts preferences.
Click the app menu, then choose Add account.
For example, in Messages, choose Messages > Add account.
Select the account provider, then follow the onscreen instructions.
If you want to add an account from a provider that isn’t listed, such as a mail or calendar account for your company or school, click Add Other [T