I F*ing Love Science: http://www.iflscience.com/ and
https://www.facebook.com/IFeakingLoveScience.
The blogs at Popular Science magazine
The blogs at Scientific American (magazine). Including the Urban Scientist: A hip hop maven blogs on urban ecology, evolutionary biology & diversity in the sciences and Cross-check: Critical views of science in the news
Podcasts from Science and Nature.
Hufington Post suggests scientists to follow: physicists, Neuroscientists and Biologists and Chemists.
From Teachthought: A 100 scientists on Twitter.
Mashable: 15 Twitter accounts for incredible science facts.
Business Insider: 40 scientists to follow on social media .
Dodo: Conservationists on Twitter.
The American Geophysical Union blogosphere.
The Science News cycle from PhD comics.
xkcd : A webcomic of romance, sarcasm, math, and language.
Minute Physics on Youtube.