my6sense (www.my6sense.com) aggregates Twitter, Facebook and RSS in one place and dedupes by source, meaning you shouldn't see the same update from one person.

my6sense (www.my6sense.com) aggregates Twitter, Facebook and RSS in one place and dedupes by source, meaning you shouldn't see the same update from one person. An added benefit is prioritization of content you are most interested in, so it reduces the noise in a big way. (I'm VP of Marketing there)