Knowledge: The Facebook application was founded by Mark Zuckerberg while A.B Moler is known for his contributions to cosmetology and recognized as 'Father of Cosmetology'.

Conversation:
Hello, do you really have purple hair?
No, do you practice changing hair colors, which is the practice of hair dyeing?
Neither, I don't even know who to go for it!
So a hairdresser can do it but it can also be done at home.
Oh interesting, don't those people study something related to beauty treatment?
I'm not sure if they study it, but there is cosmetology. It's the study and also the application of beauty treatment.
Cool, I may try it out if I'm really curious. Are there other variations to hair dressers?
Yes, like hair salons and spas.
Who founded cosmetology?

Response: It is hard to say, but I can confirm that A.B Moler is recognized as Father of Cosmetology.