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DONE Start off with user signups. When somebody signs up, send them a welcome email.
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DONE Then, let users post tweets. If another user’s handle is mentioned in the tweet, send that user a notification email.
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PARTIALLY DONE Now, let users follow each other. Of course, notify somebody by email if when they are followed. Add pages showing who a user follows, and who follows them.
Let users upload photos in their tweets. Add pagination, or the splitting up of a big list into several pages, to your index views, using Kaminari. Create a preferences page where users can opt out of different notifications.