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So you are using the share button or something like that from Facebook, or you posted a link to a discussion on Facebook . But the description is wrong or it says " No description available "
First one must understand how Facebook fetches the meta and then the info :
Normally, when you share a post on Facebook, it would pull the first few lines of the post and use it as content description (a.k.a. snippet or summary). However for most forums and blogs, especially the ones built by Template Designer, Facebook seems to pull something completely random. On some blogs it pulls texts from the comments, from blog description or from the sidebar, while on others it pulls nothing at all. Weird huh?
Facebook pulls the description from the following sources, in this order:
According to Facebook, it scrapes your page every 24 hours to ensure the description (and other share data) are up to date. However, you can manually refresh it by entering the post URL into the Facebook URL Linter.
You can do one of the following things to solve the problem:
There are three ways of adding < p > tags. Choose one.
<p>tag to each paragraph as you write your post.
<p>tag. It will apply the tag to all existing and future posts.
<blockquote>tag in your post will break the p tag. It will cut short the content inside the p tag -only the content from the beginning of the post until the the start of the tag will be placed inside p tag. And as it turns out, Blogger automatically adds a
<div>tag whenever you add an image or click on one of those text alignment icons in the post editor. So, with that in mind, make sure you skip enough text (at least 120 characters) before adding an image or before doing any alignment.
Once you’ve done with the changes, enter the URL of a post into Facebook URL Linter. Then come back, share the post and see the difference.
For the rest of your posts, their descriptions will be updated the next time Facebook scrapes them.
I hope this helps someone .....