Might be useful asking developers to add their email:)
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it cost 1$
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During your Beta, you should make it free for the first week to encourage people to get on the map! Another suggestion would be to allow other types of freelance, too! Designers, video/photo people, etc. etc. Love the idea. Great work!
When starting it is not clear that it's a paid service. For a paid service I would add a login panel to manage your account and add some simple stats like "x persons nearby", "x persons have viewed your profile" to make it more engaging to return :).
MagicPush
Link Texting
MailKing by cloudHQ