only if you have her facebook password
yes
Gmail Chat history is stored by Gmail. It is present in the individual chats of person. You can click on the contact to view the chat you had.
In order to view your full Facebook chat history, open up a chat box with the person in your friends list that you were chatting with. With Scrapboy, you are able to open up a chat box with a person even if they are offline. Then scroll to the top of the chat and click "More..." in the top left hand corner. This will bring up your full chat history with this person.
no
I believe only the creators of Facebook can do that. You can check chat history from the past maybe 48 hours if you haven't cleared the window, or cleared your cache/cookies.
u go to messages and it will bring u write back to the messages
all u do is go to the chat menu and scroll up untill you find what u want 2 delete, edit, or whatever you need 2 do
you cant
Download this software from here http://www.filebuzz.com/fileinfo/52871/Yahoo_Chat_Message_Decoder.html
you may have to call facebook
no i dont think so
No, as a general user, you cannot view someone's Snapchat history unless they specifically share it with you. Snapchat messages and photos are meant to disappear after they are viewed, so viewing someone's old messages or photos without their permission would be a violation of privacy.