SiteBlocker (Blocks certain URLs / sites from being visited.I use it to block URLs (articles ,etc) I found useless so that I don't have to read them again)
Channel Blocker ( removes videos of certain channels from YouTube - I use it to block certain channels that are clickbait but top the YouTube results)
Yes. It all depends which subs we join. My reddit feed is full of useful information and helpful people ('s posts). Though r/popular is garbage, if we join certain niche communities, it is fun and useful.