You can delete your MSN Social Activity on MSN or Facebook
Delete recent activity on MSN and Facebook
Deleting a post on MSN also removes it from Facebook.
Go to the MSN Living Style page, and in the Social Activity module, click Your activity.
In Your Recent Activity, next to the post you want to delete, click X.
|Only your recent activity appears on MSN. Your older activity will only be on Facebook, where you can delete it from your Wall or Timeline.|
Delete MSN Social Activity on Facebook only
Deleting a post from your recent activity list on MSN removes it from Facebook, but deleting a post on Facebook doesn't remove it from MSN.
On your Facebook Wall or Timeline, find the post you want to delete, and in the upper-right, click the audience selector.
Click Delete Post.