I am thinking about becoming a Vegan, you know abstaining from eating or using animal products.
Interesting, I've been contemplating that recently too. Why do you want to?
yes because I like the fact that Veganism rejects the commodity status of animals
What's the difference between veganism and vegetarianism?
Vegetarianism is more about not eating meat and food products and sometimes dairy, but not from abstaining from using animal products.
Cool do you know how many vegans there are in the world?
I don;t know that, but I know many people become vegan for health reason since a vegan diet is supposed to reduce the risk of certain chronic disease including heart desease.
Any other health benefits from becoming vegan?
The other health benefits are less clear but Veganism is regarded as appropriate for all stages of life including infancy. 
Hmm I didn't know that. how long ago did people start to become vegan?