body: I understand that a contract can be created by the actions undertook by the involved parties. When you visit a website you agree to the ToS by using the website (regardless if you read it or not). Related to my [previous question](https://law.stackexchange.com/questions/50775/can-an-employer-charge-employee-contractor-a-processing-fee-for-payment?noredirect=1) I had an employer deduct a small fee to process my payment, they argued that they were allowed to because it stated they would on the website I had to use for the job. Does this even form a contract?
  
  
  Another example, I went to a library and started using a computer. The librarian came up to me and pointed out a sign saying I had to pay before using the computer (which is uncommon where I live). Is there a contract formed by just having a sign? Hypothetically could the library sue me for not paying?
  
  
  Further, if there was a sign on the door to a private building saying you have to pay $20 to enter, if you didn't read the sign and entered, could the owner demand $20 from you? 
  
  
  
title: Can reading a something mean agree to to a contract?