Problem with description meta

Hello,

I just installed this plugin and have a problem with the description meta.
It doesn’t take the description put in all-in-one SEO pack, it puts the text of the article until there’s no more space.
How can I use the all-in-one SEO description to make it smaller please ?

Thanks in advance for your reply.

Angela

Ps : You can find an example on my facebook page. The base Ball Bear article was made with your plugin and the other one’s without plugin.
http://www.facebook.com/Playofmedley

http://wordpress.org/extend/plugins/wp-facebook-open-graph-protocol/