As LinkedIn becomes popular, your feed starts to contain different kinds of unrelated content.
This filter is a simple method to hide unwanted content from your feed.
You can use text filter to remove the type of content you are not willing to see. Political posts are meant to grab your attention and remove your productivity. You can hide them by adding unwanted keywords.
This function exists naitively in Twitter.
You are looking for specific type of people who are sharing content. The filter makes it easier to target specific people.
An example is to remove company posts.