The Siach global network is anchored in a series of conferences rotating around the globe, the first took place on May 12-15, 2011 at the Isabella Freedman Jewish Retreat Center in Falls Village, Connecticut and the second will take place in May 2012 in Israel.
Approximately 120 participants, roughly 40% from Israel, 40% from North America, and 20% from Europe, attended the first conference.
Siach aims to build connections and develop a sense of collaboration and exchange among Jews in North America, Israel and around the world. Many young Jews feel disconnected from the larger, global Jewish community even when involved in activities or organizations built around a Jewish vision of social responsibility and Tikkun Olam. Siach was developed to bring Jews together from North America, Israel and Europe to explore and articulate a common language and visions. We are looking beyond the conference to the creation of a permanent network of Jews working together to achieve a collective social justice agenda as a global community.
Source: Leadel - Leading Jewish Inspiration

If you would like to read more about Siach here are a selection of articles:
'The Reawakening of the Jewish Social Justice Movement' by Alexander Goldberg
'Siach: Embracing the Complexities of an International Conversation' by Judith Belasco
'A Sustainable Jewish Nation' by Einat Kramer
'Starting the Global Conversation' by Jessica Elgot