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Onboarding examples and feature tours
Google Maps changes - 2014 Feb
Guided tour tooltip
Introduction from Pinterest
etsy shop setup stock items
Onboarding Techniques and Examples for Your New Users
Spotify makes if fun with cool graphics.
The Google Plus Progress Bar Analysed
Growth Hacking: User Onboarding
facebook shows tooltips whenever a new feature can be used. There may be sitting hundreds of tooltips just waiting for you to be discovered. Doesn't annoy users.
workmarket informs about interface changes
workmarket allows users to switch back to the old view. no indication if this option will be there forever.