I would like to know which social networking site is best for business? I heard my friend told that facebook is best for online business, is it true?
It really depends on what you want to use it for.
If you run a dog grooming business then Facebook would probably be ideal because you can get people to share photos of cute pets that you just groomed. That could be a great way to introduce your business to new people for the first time.
If you are a stock broker then using a service like Twitter to announce news about a companies people might want to invest in could be a useful way to attract new clients and establish yourself as an authority about investments.
If you run a business that sells services to other businesses then LinkedIn would probably be the best place to network with those other business owners.
If you sell a product specifically targeted to people who earn more than $100,000 per year then Google Plus might be the best way for you to network as their users have the highest average earnings among social media networks.
If you are a fashion designer who wants to introduce your new line to women then Pinterest is probably worth spending some time on trying to get images of your product pinned.
So, it really depends on what you want to use the social network for and who your audience is.