What are the forms of SOCIAL MEDIA marketing?

I am going for a job interview for a social media marketing post in the UK and would like to know what forms does it take?

I have done marketing before but this form of marketing is new.

Social media marketing is effective when you build a network with your target market and regularly remind them of your product/service. You can use free online sites, like Facebook, LinkedIn, and Twitter, to expand your network and promote your company. It’s great!