I read blogs for the same reason most people read magazines, with the added value that I can interact with and get to know the people behind them. I get inspiration for what music to listen to, how to assemble nice outfits, new recipes to try, what film so see and books to read. I also read many blogs where people post their insights in subjects that interest me, such as feminism/equality, recycling/redesign and culture.
If I remember correctly these are the blogs that I started following back in those early days (2009) when I had never read a blog in my life before. I think it all started when I was browsing elle.se and found Elsa. I still follow - and enjoy - all of these.
And why I post in English and not my native language Swedish? Many of the blogs I read have authors that are English-speaking and so are many of my friends here in Norway or back from the time when I lived in Germany.