Tube map of independet coffee shops

Tube map of indi coffee shops

Nicely done, a wee project to visit them all.

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What is Referral Key?

What is Referral Key?

Today I received a spammy looking message from a loosely known LinkedIn contact.

My PI style investigations only got so far as this blog, where the smart Claire Diaz-Ortiz has unravelled the mysterious, steak-promising, product:

http://clairediazortiz.com/what-is-referral-key/