Information posted online can be deleted in some cases, but why would it be difficult to know if it is really gone? It can always come back on to your account because of common computer errors.
It is impossible to know if it has been copied or contained in a screenshot by others.
For many social media services deleting does not remove it, just makes it invisible.
It is illegal in most countries to delete certain personal information online.

The program below has been generalized to read a user's input value for hourlywage. run the program. notice the user's input value of 10 is used. modify that input value, and run again. generalize the program to get user input values for workhoursperweek and workweeksperyear (change those variables' initializations to 0). run the program. monthsperyear will never change, so define that variable as final. use the standard for naming final variables. ex: final int max_length