Social media networks and advertisment

[Ureka]

We all know social media is a very important and powerful tool for advertisement, publicity and marketing of our products and services.
We have so many social media networks right now each having tons of people and potential customers, now out of these social networks which do you think is most effective and will bring more traffic and sales to your business/store/brand if used for advertisiment of products and services.
I will mention a few, tell us why you picked them.

1. Facebook
2. Instagram
3. Snapchat
4. Twitter
5. Eskimo
6. YouTube
7. Twitch
8. Quora
9. Reddit
10. Add yours