What is a good tool to find relevant communities and threads?

For example, I want to find all communities (Facebook, Reddit, forums) about electric cars and then find all threads about cars' electric usage, energy saving, etc. Right now I have to do it manually, and it takes a lot of time.
Jonathan JamesAlways Reaching. · Edited
@Meetup offers you a real community of people who're talking about real events right after sign-up. Instead of being thrown into a forum atmosphere where people could be fake, Meetup, is full of people who have decided to come together at events centered around different topics. Over the years, so many people have gone to meetup to find relevant communities that Meetup has been further developed and it works very well! There is a public feed that you can post on, but ultimately the point is to get to the next event that the Meetup group you joined is having so that you actual engage your community in real life. … See more
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