There is no user rating system natively written down into ActivityPub, so it's pretty safe from number boasting. Now, to some it might look like a letdown, but think of the advantages, how it changes the way people interact with the content. It's a place where every post shall be seen by its own merit and authors as (somewhat nuanced) individuals.
Posts can be favorited and boosted, with all counts visible on original instance. Users of one instance don't see favorites count made by users of another. Favoriting is more of a peer-to-peer appreciation, signal of nodding. Boosting matters more as it repeats the post in your followers' feed.
Here, you are simply encouraged to make reference links, whether it's your blog, documentations, downloads or news you found.
Feed is filtered by users themselves: following right persons, muting, temporary boost-muting, blocking bad actors. They can report content that violates server rules, as well.