Even if the Meta Description is not an important element in the Google ranking algorithm, we can always increase
our CTR (Click-trough-Rate) from SERP (Search Engine ranking Position) .
Personally I use alternative keywords and extend the importance of the page in Meta Description .
A Missing Description can be the reason why users are bypassing your site pages.
We must always keep our Meta Description unique, duplicate Descriptions can hurt your CTR.
I always try to keep descriptions in the 156 characters limit .
Check the Complete SEO DIY Guide !