If you are happy with the people you are currently following and want more of the same, check out Coracle.Social and go to your settings. Crank your web of trust minimum up to 10 and jump into the global feed.

No spam and the folks who show up that you aren't already following are likely to be worth considering.

If you are looking to branch out,I recommend lowering your minimum web of trust to 3 or so and then search for posts by hashtag. Any tag you think someone might use for the topic you are interested in will do.