A waitress gave me her number, what does it mean?

[jcgonzmo]

I met the most beautiful woman an hour ago. She was the waitress of my table. I was having dinner with some friends. One of our friends ask her to take our picture, and she did. I dont know why, I had a feeling she was smiling at me. So I joked and put all the guys around her and me her take a picture with all of us. At the end of the night, I show her the picture and told her that I liked it. She said she liked it too. I ask her how should I send her the picture. She told me that she doesnt use facebook, but she has twitter. I add her to twitter. However, she alone, told me that it is best that I should send her the picture using whatsapp, so she gave me her number. What should I do now? What does this mean, that she gave me her number alone?