As Matt said, it's like any other app. You can download and install the app on multiple devices at no additional charge as long as they are all registered to the same iTunes or Google Play account.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
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