SheQuotes quotes women exclusively on Twitter and Facebook. This week's favourite quotes are listed below. If you use these quotes, please attribute them to the women who said them.

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Facebook COO Sheryl Sandberg looks at why a smaller percentage of women than men reach the top of their professions -- and offers 3 powerful pieces of advice to women aiming for the C-suite.

As the COO at the helm of Facebook, Sheryl Sandberg juggles the tasks of monetizing the world’s largest social networking site while keeping its users happy and engaged.

Talk show host Oprah Winfrey, one of the most powerful women in the world today, delivered the commencement address at Stanford University on June 16, 2008.

Here is the full text of her speech (to watch the video, click here):

Thank you, President Hennessy, and to the trustees and the faculty, to all of the parents and grandparents, to you, the Stanford graduates. Thank you for letting me share this amazing day with you.