GuideStar has acquired two new organization, Philanthropedia and Social Actions, and, in the process, a new office on the US west coast.

Philanthropedia, an online listing and giving platform, canvasses the views of experts in the non-profit field on effective non-profit organizations in various cause areas. The site then lists causes under various headings such as microfinance, climate change and childhood education and grades them according to the number of expert recommendations. Donors can review these and donate to them through the site.