All social networks are not created equal, which is a good thing. Different social platforms cater to specific audiences. To answer the question quite simply, the social media networks you should be on are the the ones your customers and prospective customers are on.
Below are the social platforms you should think about joining in order to achieve three things:
Increase your online presence
Connect with colleagues
Help drive customers to your website
As the world’s largest professional network with over 55 million members and growing rapidly, LinkedIn connects you to your trusted contacts and helps you exchange knowledge, ideas, and opportunities with a broader network of professionals. LinkedIn is a place to show off your mad business skills, but remember, keep your posts and profile professional. This is not the place to post images of employee birthday partys or silly meme pictures.
It is a free social networking and microblogging service that enables members to send and read tweets. Although tweets are limited to 140 characters, the real power of Twitter is in the hashtag function. Being able to search specific hashtags to see what people are talking about is a very power tool for business.
By leaps and bounds, Facebook is the undisputed giant in social media. Facebook users range from tweens to grandparents who just want to see the latest pictures of their families. Facebook as a great medium to share your corporate culture and show customers there are real people working for them.
If you have a brick and mortar location that customers come to, you really do need to be on Google+. When people are searching for you on Google, who do you think Google is going to pull their data from...? That's right, their database.
So ask your customers what social media platforms they use and get on them. Be out there, be social and engage with your customers.