I agree that Twitter may not be much different from Google if you are relying on the algo. Notice that I mentioned Twitter as a community next to Reddit though. Everyone has different usage patterns for these services. I follow (and have been an active participant) in a number of niche communities on Twitter. In some cases, I could do a search for a term and most results would be from people I have interacted with through Twitter and other channels. Each of those people carried a reputation within that niche and some I knew better than others. I wouldn't use Twitter as a general search returning a large number of untrusted results. Sure, even search results on a specific user could be biased, but at least it would be from familiar territory.