The Paris-based social curation platform Pearltrees just announced that it has raised a Series B round of 5 million Euros (about $6.62 million USD). The money is coming from Group Accueil, which had also invested in the service’s previous round. In total, Pearltrees has now raised 8.5 million Euros. The company, which launched its first alpha almost 3 years ago, aims to use this money to scale its product and – maybe even more importantly – implement a freemium business model for its service.

The company did not publicly discuss what exactly this freemium model will look like.

Pearltrees is probably best known for its highly visual interface to its collaborative curation service. Some of the most interesting technology the team has developed, however, actually powers the discovery mechanism that is slowly becoming a more important part of the user experience (especially in Pearltrees’ recently released iPad app). This so-called “TreeRank” algorithm – named after the way you organize your bookmarks/pearls on the site – allows the company to interpret and expose the interest graph its users generate through their bookmarking  activity on the site.

Pearltrees, according to its own data, had about 1 million unique visitors in January, which accounted for about 30 million pageviews. In total, about 350,000 contributors now use the site. Interestingly, only about 25% of Pearltrees users are American.

Pearltrees and Pearltrees story / Pearltrees development / Ecosysteme in Patrice Lamothe (Patrice)

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