If you want to build a blog, the reality is that Twitter is one of the most important platforms for sharing, probably followed by Google+, at this point. If you’re in a home/food/how-to niche, Pinterest may be important to you as well. If Facebook seems like a place people talk about your topic a lot, it might be useful, too.
There are plenty of tools out there — among the most popular are AddtoAny, ShareThis, and Sharebar (which is what I’m currently using).
Reverse-engineer your social-media success by noticing what sorts of posts get shared a lot in your niche, and writing something along those lines.
the key ingredient: Write a strong headline
Use hashtags
Use a scheduler
Don’t just keep retweeting your headline and link. Instead, vary what you say.
Be sure you share other things inbetween the repetitions of your new post. Do some scanning, find some interesting stuff, and lace it into your schedule as well, so you don’t start looking like an obnoxious salesman and continue to appear to be putting out useful, varied info.