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facebook apps should
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  1. show you what they do before asking you to invite more people — 4 people
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  3. get their own less intrusive "requests" section. they should not be mixed in with actual useful things like group requests, event invitations, photo tag requests etc — 1 person
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  5. let you use them when installed on other people's profiles without having to install them on yours — 1 person
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