Hey, I noticed in the last few days all my Feedburner feeds stopped posting to my Facebook & Twitter pages. I checked on Feedburner, and did a "ReSync Now", and got this message: "The URL you entered does not appear to be a valid feed. We encountered the following problem: Error on line 448: The markup in the document following the root element must be well-formed." The same sort of message shows on most of my feeds. How can I fix this?
Validate your website's with feed validator. It will notify you about where you are getting the error