How to Delete Messages Sent to someone On Facebook
Action 1: Check in to your Facebook account.
Action 2: Click the "Messages" switch in the menu on the left to open the Messages page.
Action 3: Click the conversation which contains the sent messages you wish to delete. Facebook displays conversation threads in date order with one of the most current at the end of the web page.
Tip 4: Click the "Actions" switch at the top of the conversation screen.
Step 5: Select "Delete Messages" from the pull-down menu.
Step 6: Click to enable the check box next to each sent message that you want to erase.
Step 7: Click the "Delete Selected" switch and then click "Delete Messages" in the confirmation pop-up home window. Facebook removes the picked messages.
Idea: To erase a whole conversation, consisting of all obtained as well as sent messages, click the "Delete All" choice after opening up the "Delete Messages" display.