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Ask Shama: How to leverage social media for holiday good?

Dear Shama,

What social media would best help me to connect a group working together on a charity this holiday season? It will culminate to a single big event. I’m thinking a Facebook page and a presence on Twitter so we could support each other during the event that day, but would love a new idea. We may also like to host a contest. Is there a great place to post pictures and have people …