There's only so much noise on Twitter as you opt-in to. You don't have to follow a bunch of people on either service.
One of the reasons I created Subjot was because I wanted to share even more. On Twitter if I don't post about tech or nyc tech I lose followers but I have so many more interests than tech. I wanted to post about music, football, street art etc, without spamming people who only care about my posts in tech.