I don't think Jive exposed some settings/system-properties to have this feature. But, this is technically possible through Jive core customization's
If you want users to post anonymously content, comment or rate a content.. anything w.r.t content then you have to customize Java classes, Soy, JS and FTL files. you can wrap all of these as a plugin or through web-overlay. Good Luck
Thanks for the reply Gopi.
I guess I got a way by using permission levels settings.
Ours is a jive hosted public facing community.
I saw that Jive provide a user group called everyone which are the guest users.
we can create custom permission level for this group which allows them to like or rate a content , in our case document.
then we can apply this to the space where we want anonymous users to get engaged.