【Product】How to induce user to share?

When I use a app in the sina twitter, I found that after the test result come out, this picture pops out to me:Who takes care of you most?
When you see this picture, familiar and comfortable?
It smartly record those who remark and spread your twitter most and recommend those people to you to share your result with. It's a smart idea!
People tend to share information with those they feel comfortable and safe, they have a better chance to choose the "yes" button and share this app.