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Facebook's No. 2 exec pays tribute to single mothers

Facebook Chief Operating Officer Sheryl Sandberg says that until her husband's death, she never realized how hard it is to be a single parent.

She says in a touching Mother's Day weekend Facebook post that odds are stacked against single moms. She says many live in poverty, work two jobs or don't have paid leave to care for themselves or children if they get sick. She calls on leaders to rethink public and corporate work force policies to better support single mothers.

Sandberg's husband, Dave, died in a treadmill accident a year ago while on vacation in Mexico.

She concedes she's fortunate not to have financial worries of other single moms and admits she should have spent more time writing in her book about women raising children without a partner.