I prefer reading Hacker News and Reddit, but those aren't sites where you can or should post a lot. For that, there's Twitter, and probably also Google Plus, though I can't remember the last time I posted there.
I used a lot of social networks, but all have fallen by the wayside except for Twitter. It retains the simplicity of a text post and fits my "posting style"
I created my own blogPoster app because I wanted to make the act of writing and publishing a social media update to my own site and Twitter as seamless and easy as possible