I have searched on the in the internet for examples of both usages and I came across this post in a thread at this forum
- We would like to thank everyone for their support.
- We would like to thank you all for your support.
- We would like to thank all of you for your support.
However, the poster does not go into the details as of why it has to be that way. What I wanted to say was "I would like to thank everyone for their awesomeness" while talking to a group of friends. However, I hesitated and I "corrected" myself by saying "I would like to thank everyone for your awesomeness" in the same situation. However, I am not sure of which sentence is correct. I will appreciate your expertise on this one!