Sure they can! Facebook is on the internet so as long as you log out once you have finished you can have as many as you want. But you can't have them open at the same time...
(Use multiple browsers. i.e. internet explorer and mozilla, i do it all the time) easier yet if using IE8. logon to facebook then from the IE file menu select TOOLS>InPrivateBrowsing this will...
Yes,
you can use "outlook" or "outlook express" and enter the settings on there to allow you to use quite a few email accounts on there. then to switch between the two you can simply just switch...
Click on the Sign In button underneath the Search box (top right corner of iTunes store). If the button is showing an email address click it and then log out of that account. Go through the Create...