Often times the best posters are not the same people publishing the best stuff in their field, but sometimes they are. Aggregators are a different category.
What types of science are you interested in? Some random accounts that I can see right now:
@ShanuMathew93 - renewable energy tech and biz and news
@IdoTheThinking - California housing
@TheStalwart - finance, macroceconomics, microeconomics, etc.
@doctorveera - general genomics