Change meta tag description from name to longdesc

hello, i would like to change the metatag description that is generated by osproperty and use a truncated version of the longdesc field instead of the title of the property. I see this in html output:

<meta property="og:description" content="MY PROPERTY TITLE" />
and i need to change it to
<meta property="og:description" content="TRUNCATED VERSION (or eventually full version) OF LONG PROPERTY DESCRIPTION" />

this would be very useful to everybody.

thanks Dang..

Hi,
The og:description field retrieves data of field Meta Description. The field "metadesc" is in MySQL Table: #__osrs_properties
Currently, Attribute of it is varchar(255), you can change it to Text
Thanks
Dam