Katie Couric often uses her vast social media platform to help others and at the start of the week she did just that.MORE: Katie Couric stuns in figure-hugging swimsuit on the beachThe journalist took to Instagram on Monday to share a heartbreaking story about a woman called Betty who had lost her wedding ring while out walking in Maine.Tragically, Betty's husband passed away in 2008 and the loss of the ring has devastated her. VIDEO: Katie Couric reveals big news with her fansKatie shared