by finding out what sorts of problems and questions your readers experience and blogging about them. Answer the questions that are common to your field. Where possible, provide solutions to common problems.
Social media managers working for larger companies need overall marketing experience. There is much more competition or these types of social media jobs.
It is not so easy get expert in certain field using your blog and social media.These are slow but long term tools to be successful in any field.You have to be patient and provide unique and good content. Once you get reach it will remain on internet for longer period of time.
Expertise is gained trough education and experience, not by stereotypical leftist brainwashing, conceit on Facebook, or by the abuse of such brain death as Twitter.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them