I played with Cluster after it first launched and didn't find a need for it although I can see my mom really digging it. She's a photo nut, often creating physical albums and framing her photography but Facebook and Instagram lack the personal interaction of sharing an album with close friends and family.
I'll have to try it out again but I'm curious how it overlaps with Heyday and Memoire.
The family photo market is enormous, and if my family is any measure a lot of people still use shutterfly and other print-oriented services. It'll be interesting to watch over the next few years as more and more grandma's start getting iPhones what happens
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