How to review/give feedback to specific apps for the 9650?

Where can I give feedback to specific apps for the 9650? I'm referring specifically to the latest updates/upgrades to the Ebay app and the Facebook app.

The Ebay app no longer allows you to delete old messages from your inbox.

The new Facebook app does notify me when there are new messages to view.

It would be great if I can notify people working for Bold 9650 and their respected counterparts who makes these apps available. I don't want to write feedback and it end up in the dustbin for no one to see.

Those apps aren't specific to the 9650. They're specific to the OS (OS5 BB6 BB7). Check the RIM site for support pages for those apps. Maybe there's a place to provide feedback.