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Scrapblog has gone far since its beginnings as a scrapbooking service back in 2006, integrating with Photobucket, adding a virtual goods marketplace, and generally establishing itself as one of the leaders in the online digital scrapbooking market.
Mixbook, on the other hand, offers collaborative photo book, card and calendar building and sharing, with plenty of free designs for its users to choose from. The two services are a natural match, and combined they have more than 5 million customers, Mixbook claims.