[LifesGreatestGift]

there is no need to put anything in headinclude.

make sure you delete your original
<meta property="og:title" content="{TITLE}"/>
from whatever template you put it in, then in FORUMHOME
add
<meta property="og:title" content="{vb:raw vboptions.bbtitle}"/>

and in FORUMDISPLAY add

<meta property="og:title" content="{vb:raw foruminfo.title_clean} - {vb:raw vboptions.bbtitle}"/>
incase someone decides to manually share a link to a forum instead of the main forum page (FORUMHOME) or a thread (SHOWTHREAD)

SO....
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FORUMHOME
<meta property="og:title" content="{vb:raw vboptions.bbtitle}"/>

FORUMDISPLAY
<meta property="og:title" content="{vb:raw foruminfo.title_clean} - {vb:raw vboptions.bbtitle}"/>

SHOWTHREAD
<meta property="og:title" content="{vb:raw thread.title}"/>
if you'd like to include the name of your site after a thread title then do the following
<meta property="og:title" content="{vb:raw thread.title} - {vb:raw vboptions.bbtitle}"/>