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Tässä pätkä tenttimateriaalista:



Loopt also allows its users to share

their location with only a subset of their friends. Gowalla

allows the user to browse who checked-in at a location at

what time, even if they are not friends. On Gowalla’s main

website, every user’s complete check-in history is public, which

is probably not what the user has intended for. All LSNs,

except Dodgeball, allow their users to explicitly link their location

updates with external services, such as Facebook, or public

websites.