This isn’t new but I feel might have been forgotten by brands.
Brands have been quite angry with Facebook for slashing organic reach a few months ago, but brands have also forgotten a little algorithm change that Facebook quietly released to help brands get more reach.
If brands tag another brand page in their posts that post could be seen by Facebook users that don’t follow your brand but follow the brand you have @mentioned. I would not suggest this is used all the time, but if used correctly should help post organic reach.
Example: if McDonald’s mentions its partnership with NBA star LeBron James, and tags him in the post (as they did below), that post may now appear in news feed for fans of either McDonalds or LeBron.