Check this Death Stranding guide on the game's "like" system. Including what are likes, how to get likes, benefits, advantages, and what likes are for.
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Useful Articles To Know Death Stranding
Beginner's Tips & Strategy GuideWhat Is The Like System?
Free System Of Giving Thumbs Up

In Death Stranding, you can give free "likes" to a lot of things you can interact with in the game's environment. This can be your actions towards BB & even structures or items left behind by players online.
Check Out What You Can Do Online!Anyone Can Give Likes

In the world of Death Stranding, almost everyone & anyone can give likes. Sam, BB, and online players can all give likes to you, your structures, signs, or actions.
Check Out Multiplayer Guide Here!What Are Likes For?
Used To Progress Porter Grade

Likes are used to increase Sam's Porter Rank, which will provide additional titles and benefits as it progresses. Likes can be obtained from Orders, but assisting other players will is a sure way to get more.
Check out How To Get Likes Fast here!Can Show How Useful Item Or Structure Is

When you come across an item, structure, or sign that has many likes, it is worth a look. This means that many players have found this liked object useful in their adventure.