Definitely Facebook, LinkedIn, and Twitter, but there's a fourth very important one and that's Pinterest. I'm surprised only one person's mentioned it...
Twitter Google+ Pinterest All the above 3 brings good traffic. But for me twitter works best among these.
For marketing purpose, you have be flexible and have to use as much mediums as you can use. Google+ and Twitter are very common but effective.
Definitely Facebook, LinkedIn, and Twitter, but there's a fourth very important one and that's Pinterest. I'm surprised only one person's mentioned it...
In my personal opinion best Social networking sites to promote a business are: 1. Facebook 2. Twitter 3. LinkedIn By creating Facebook fan page we can promote our business and brand name among clients. Twitter is an excellent tool to inform updates about our company status and announcements to the subscribers. LinkedIn is a professional network where our profiles have the potential to be found by potential clients.
I would highlight LinkedIn, Facebook, Twitter. Then go Youtube, Google + and Pinterest. You may look at infographics that illustrates the mest social networks for business http://socialtimes.com/the-top-9-social-networks-for-business-infographic_b102587
facebook and twitter are the main ones the reason people use social media to advertise is that there are so many people on them so going to a lesser known social media site defeats the point but if you want another site, LinkedIn would be a good place to start as it is aimed at more professionals and people have enjoyed success from there hope this helps if you are having trouble with facebook marketing have a look at the free training bellow, as it talks alot about how to facebook market
FB, Twitter then Google + FB and Twitter have already been shown to affect site rankings and Google + is growing by leaps and bounds too.
Check out this article that shows how important social signals are in todays IM and rankings: http://www.searchmetrics.com/en/white-paper/google-ranking-factors-us-2012/ Continued Success!