There are two tabs for messages. Click on your normal tab and then look just behind it for 'other'. Normally this is where people can send you messages who aren't in your friends list or those who you haven't contacted can leave a message. You can choose to view and accept any messages or not.
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You can to an extent. After about 20 messages the others begin to delete.
If you cannot reply back to someone on Facebook, check to see if you have them blocked. You may also need to change your settings to include them in who can see your posts.
I found that the following worked:Make sure that you are logged into Facebook mobile on the BBfrom the messages list press the BB key to bring up menuselect "View Folder"scroll to Facebook Messagesselect the folder( you will see a list of messages, and "Facebook Messages" above the listscroll to the message you want to delete ( dont open it as this takes you out of the folder)press "del" key and select delete from pop upBlackberry 9000 v 4.6.0.162 / Facebook app 1.9.0.28
If you completely deleted the messages, from the message box, you cannot retrieve your messages. If you cleared the messages from the chat box, you can go to your messages at the top of your fb page and click on MESSAGES, and your messages should still be there.
Basically, you can see everything they do but they don't know your looking. Bit like you have a friend but there not friends with you.