The problem is when you share a page on Facebook – there is no option to choose from variety of thumbnails as it regularly happens. Instead the only thumbnail you may post to FB along with your post is an avatar or gravatar.
How this avatar thumbnail problem was solved:
1. First look into the source code in header section for doctype information. I fyou see something like this below, you need to insert piece of code that Facebook needs to share your page with multiple thumbnails.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
It should look like this:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en-US" xmlns:fb="http://www.facebook.com/2008/fbml" xmlns:og="http://opengraphprotocol.org/schema/" >
<head profile="http://gmpg.org/xfn/11">
Missed piece of code is highlighted in lime. So you just need to add it to the header section of your WP template (or other platform), usually located in header.php.
2. This is under #2, but in fact could be the only issue to fix for correcting the FB thumnail problem.
If you use Share and Follow plugin – go to admin and disable Share Image option of this plugin. See the screenshot below:
3. Cool, yeah? But it still doesn't work.. Now the most etertaining part of the process: you have to copy and paste each URL of your posts into FB Linter here – and only after FB "cleans up" its cache/memory of your pages, the multiple thumbnails option will be available.
Good news is all your new posts will work fine – no actions needed for them.
