As a rule of thumb:

➡️ When the post does not have a large reach, or wide audience, and is unlikely to be seen by many people– do not engage.

➡️ When the post has a large reach, a wide audience, or is likely to be seen by many people, feel free to engage.

➡️ There is one time when you might want to engage with a post that does not have a large audience– if the post has a simple, easy to debunk claim in it that you can clearly refute with a short reply.

➡️ Do NOT let yourself get lost in writing multi-paragraph responses to junk that no one else would see anyway. It only wastes your energy for no good reason.

context link