There are literally tens of thousands of blogs ranging from broad overviews of scientific breakthroughs to in-depth coverage of a specific scientific niche. Check out this 一覧 of 上, ページのトップへ 100 cutting-edge science blogs.
There's enough social networking sites out there for humans. This one is strictly designed for dogs! Yes, あなた read it correctly - for イヌ :) And イヌ can have their own blogs set up there as well.
Do あなた read Techcrunch, GigaOM, eHub, MOMB and all the other usual suspects? This page aggregates the most 最近 10 headlines from all the 上, ページのトップへ web 2.0 watchdogs. Very useful.