Social media advertising: what channel or social media sites my business should have a presence on?

I don't know.

Neither does anybody else.

I would suggest that you identify your target market: identify what social media platforms they use: and undertake a small test marketing programme on it.  Measure the results.  Change something, and measure again.  Test another platform, measure and adjust.  As the results get better, increase the size of the programme.

Before doing anything, you should be able to answer these two questions

1) What is the purpose of doing this?

2) How will we measure the results?

This system of trying things out, measuring the results and adjusting what you do is everlasting.  6 months is a long time in social media land.  What worked last year may not work this year and almost definitely won't work next year.

Every business - every product - is different.  The only way you can discover  the most effective marketing channels is to experiment.

Facebook, Twitter, Instagram presence is must for any business this days.

Hi Lina,

Facebook is definitely the way to go..  Working on Google ads, as I thinks comes in the second place. Facebook users are all over the place and your can easily direct Facebook to show your ads at based on the location of the user.. 

Facebook, Twitter, Instagram