When you make changes to your Event Web Page or logo, or when your participants make changes to their Peer-to-Peer goal or page name, the changes will show immediately when the page is shared. If you have any trouble with these changes, you can clear the cache using the Sharing Debugger.
Click the link for your fundraising page or Event Web Page, and copy the link from your address bar.
Click the Sharing Debugger link above, enter the URL you copied into the text box at the top of the page, and then click "Debug."
On the next page, click "Scrape Again." This will usually clear the Facebook cache on your page. It may take a moment or two for your page to update, but you should see the new images once the debugger page reloads. If not, it's okay to click Scrape Again another time.
These updates will apply only to new Facebook posts. It will not update already posted information.