"Push" emails and feeds
When you set up an email account or a social networking account such as Facebook, your handheld device will automatically retrieve whatever available messages, contacts, calendars, photos, and feeds are associated with your account so that it’s always up-to-date, as long as you have a cellular data or Wi-Fi connection. If you’re connected to a cellular network, this may incur charges.
You can change the settings for most types of email accounts to update your messages less often, or only when you choose. To change your update settings for an email account:
Go to Settings > Email + accounts.
Tap the account you want to change.
In the Download new content list, choose how often you want to receive updated messages. If you want to receive them only when you request them, tap Manually.
Facebook accounts are always updated automatically. If you don’t want to receive Facebook updates, you need to delete your Facebook account from your handheld device.
To delete a Facebook account:
Go to Settings > Email + accounts.
Tap and hold Facebook.
Tap Delete.
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