"One of the many ways of spreading scholarly information throughout the Web is the research, or science blog...Science blogs can add to the transparency of the scientific process by reviewing and discussing the science culture in general and scientific research in particular. They allow informal post-publication peer-review, as well as reviews from people who usually would not be considered 'peers'."
Source: Shema, H., Bar-Ilan, J., & Thelwall, M. (2012). Research blogs and the discussion of scholarly information. PloS one, 7(5), e35869. doi: 10.1371/journal.pone.0035869
PLOS (Public Library of Science) Blogs
PLOS Blogs is a network of blogs focusing on science and medicine. It is primarily made up of six blogs written by PLOS journal editors and staff, but also contains posts from sixteen independent blogs written by science journalists and researchers. You can search the site for posts on a particular topic. Statistics provided include number of tweets, likes, shares, and more.
ResearchBlogging.org
"Do you write about peer-reviewed research in your blog? Use ResearchBlogging.org to make it easy for your readers — and others from around the world — to find your serious posts about academic research. If you don't have a blog, you can still use our site to learn about fascinating developments in cutting-edge research from around the world." (Description from website). You can browse blogs by broad subject area, such as Anthopology, Engineering, Philosophy, and Social Science, or search for blogs on a specific topic. Provides statistics on the number of times each blog has been viewed.
ScienceSeeker
"ScienceSeeker is a central site for finding and following science news and discussion. We collect thousands of posts and articles from hundreds of science sources; we aim to be the most comprehensive science hub on the web." (Description from website). Posts that include citations are displayed displayed as a group. You can search ScienceSeeker by broad subject area (including astronomy, education, mathematics, and posts with citations) or by keyword. Includes no statistics on the number of times posts have been viewed.