A Canadian woman's effort to keep a San Francisco man from committing suicide is becoming something of a movement on Facebook. Days after Kimberly Furnell of Nanaimo, B.C., created a suicide-prevention Facebook group on June 5, it had 47,000 members, the Vancouver Sun reports. She'd seen a message in the anonymous postcard site PostSecret.com that read in part, "I have lived in San Francisco since … [Read more...] about Grassroots suicide prevention in Facebook