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Official Description

With Visitor you can save places to remember them and share them with other people.

Features:
• Create places of arbitrary size: Places can be as large as a country, or as small as a single tree.
• Assign custom tags to places and use them for filtering.
• Visit places, up- or down-vote them and leave comments.
• Use Visitor place URLs to share places on other services like SMS or Email.
• Use Visitor offline: Create and view places without an active Internet connection.
• Share hidden places with selected people.