Hello,
I recently logged into facebook on my Android HTC, and noticed that doing so caused the app to post the recent activity on my wall (ie "__ is now using Facebook mobile from his Android phone.) I do not want this on my wall and can't see it to delete it when I'm on my profile, but when I preview how my wall looks to someone else, the post is visible as well as when I see my wall from another friend's account. Could anyone please guide me in the possible ways to get this post removed? Thank you!

*it should be noted that I'm seeing the unwanted activity post when on my laptop, and other ones as well.