Outta San Mateo, this Yelp-like site has users create lists of stuff they've done/wanna do, share related anecdotes/post photos, and comment on others' submissions. At best you'll discover new activities to do, at worst be privy to discussion around far-flung lists from where to pick up surfing (not Ocean Beach), to "People I Wanna Punch"...damn, these Diddit users roll hard.

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Check out Diddit.com