Not only this, there are many other social media platforms such as facebook, reddit, twitter, google, LinkedIn, medium, filpbord, etc.

i prefer facebook, instagram, pinterest, twitter and linkedin for my online business.

i think it is facebook and linkedin.

Focus on LinkedIn if you are business professional. Which connects more business people. Because which gives potential growth to your business.

Here is the quick review of some cost effective ways for lead generation, content marketing, email marketing, social media are the most used ways for generating leads. Some tools are also effective to get good quality leads such as,
LeadLake.com
Unomy

Facebook & Twitter is best to business promotion.allows all the followers or likes to view all your updates all times which leads to people to be updated about all latest news and trends about your business.

No doubt about this, facebook is front runner from all social media channels.

Twitter, Facebook

twitter and instagram

Facebook, Twitter, Google+, Pinterest, LinkedIn and Instagram is the best social networking site for business.

facebook, nowadys linkedin also play a major role because most of the people those who using linkedin is a high profile people

Facebook & Twitter those two social networking sites are best for your business.

I see that this thread hasn't been used that much lately.
But i agree that Facebook is one of the best. But nowadays we see influencers do a lot for the businesses. It is good to have this in mind if you want to boost your business.

Here you can use Instagram or Snapchat. For instance we see influencers like Kylie Jenner and Cristiano Ronaldo increasing the popularity of different products and companies by one single post.

Well of course these two people gets paid very much for each post so if your budget is below low you can target smaller influencers that target your specific segment.

Facebook,instagram and Google Plus which mostly people avoid

For business Facebook, Twitter and Pinterest is the best option for you