Does it make sense to render
<title> that have the same value on a page?
Facebook & co take the
<title> tag as fallback.
It seems counterintuitive to me, but if we take IMDB as an example of proper implementation, we can see that they use the same value for the
To see for yourself, view source on an example movie like this one:
then use Ctrl+f and you will see the following:
og:title - "Up (2009) - IMDb"
<title> - "Up (2009) - IMDb"
Interestingly the open graph protocol website uses IMDb as an example but shows different markup than what IMDb actually uses. So it's possible that IMDb has changed their markup recently.
In any case, if it were wrong to the point that it breaks things then IMDb wouldn't be doing it, so I think it's safe to say you will be fine if you use the same value for your