Oprah Winfrey on her South African school, educating girls, and charity work: 'It's like looking into the face of who I used to be.'

Oprah Winfrey says people can easily feel ''overwhelmed'' by charity work and community service but should ''not be confused by the voices of the world telling you what you're supposed to do'' and focus on what you are able to do and give.

The talk show host of The Oprah Winfrey Show (SABC3, weekdays, 17:30) in a new interview that was streamed on Facebook with Facebook COO Sheryl Sandberg talked about her South African school, The Oprah Winfrey Leadership Academy for Girls (OWLA) and talked about how investing in a girl changes communities. ''Investing in a girl changes not the face of one person but at least 5 people. And if that girl goes into her community, you've affected an entire community,'' she said.

Oprah Winfrey gave a one hour interview to Sheryl Sandberg in front of Facebook employees and which was streamed on Facebook. ''What lessons could you teach governments about investing in girls?'' asked Sheryl Sandberg.

''I have 400 girls at my Oprah Winfrey Leadership Academy for Girls in South Africa. The first graduating class will be at the end of this year. Im so proud of my daughters. They call me Mom Oprah,'' Oprah Winfrey said. ''This first class and 2nd class - I actually went out and handpicked every one of those girls, going village to village and to province after province. I know this whether you're a government or a just person: when you invest in a girl, you change a community.''

''When you invest in a girl, a girl – unlike boys, not to disparate men – girls are far more likely in every study ever been done, if a woman or girl is educated she is going to educate her children. If she's educated she's far more likely to have fewer children, she's more likely to use protection, she's more likely to take care of herself and her children. She's going to take what she's learnt and share that with her entire community. Investing in a girl changes not the face of one person but at least 5 people. And if that girl goes into her community you've affected an entire community.''

Oprah Winfrey said ''people get very overwhelmed. The way of being of service is answering the call for yourself: What is it that you want to do and what is it that you want to give? Not to be confused by the voices of the world telling you what you're supposed to do.''

''If you are going to try and help Africa for example, you can become completely overwhelmed. You don't know where to begin; there never is an end to all the help that you can do. Focus on what you can do. For me it was education. I knew as a coloured girl - now African-American - that without an education I wouldn't be who I am.''

''I wanted to give back what I've been given. I advise other people to do what relates to you. Do what stimulates you. Giving to girls is what stimulates me. It's like looking into the face of who I used to be and now seeing what they can become. Investing in a girl is the best thing I think that you can do,'' said Oprah Winfrey.

Watch the hour long interview: