Do NOT accept that friend request.
Because they will know if you're on Facebook during work.
Source: cheezburger.com
And you cannot talk sh*t about your manager or you are bound to get fired.
Source: funnyjunk.com
Because if you post something that was meant to be a private message, they will know your dirty secrets.
Source: totallytop10.com
They will know when you're lying to them about missing work.
Source: smh.com.au