Professional Networking sites are for professional people, mostly for them who are online business men. Professional networking sites are one kind of social networks but there you can mostly professional people. But when a site become popular it becomes general as you can see LinkedIn it is known for professionals but you can find there so many general users because it is so famous and there are many things that you can do even if you are not a professional. It is same for Twitter and Facebook also; Twitter got famous as a microblogging site but you can find there all professionals. And Facebook is known as social networking site but there also you can find professionals and now that is really a professional network.

LinkedIn
LinkedIn is world’s most famous network for professionals. You can exchange information, ideas and opportunities there. It is not limited to a single country, means it is an international network. You can upload. You can search Jobs and ask questions there.
XING
Xing is second most famous professional network. So it is a social network for business professionals Get in contact with professional people, find a job for you and grow your business.
Naymz
Want to make your professional network? Naymz can help you. You can manage your professional brand and communicate with your network.
Meetup
Do something, share something, learn something, and change something. Meetup is for local events or meetup, a meetup can be on any subject and it can be for business also.
Plaxo
The basic idea behind Plaxo was simple, to have an address book of your contacts and get updates from your friends and from other networks. But we know having contact list is a sign of professional people.
Viadeo
Viadeo is for networking; find your colleagues and classmates, for business; find new customers and contacts, for career; make your career with Viadeo network.
Ryze
It helps you to expand your business network. Make business contact, find people you already know and in more you can post free classifieds also.
Ecademy
It is also for business network, you can find business contact. Find groups and events, market place and blogs.
Focus
This is the place where business makes decision. It is little different from other professional networks. It is focused on Business more than relationship. You can ask questions, make research and find about information technology, marketing, sales, customer services, operations, human resources etc.
Weebiz
Weebiz is a business community where you can promote your company, your products and to engage in a new and profitable business network.
Manta
You can find here company profile and company network. You can find vital info on small business. You can find video, jobs, reports and white papers.
Dublinetwork
Dubli is a worldwide business network. It has a unique individual business models. Anyone can establish their own business in a competitive market.
Efactor
It is a global network for the entrepreneurs and by the entrepreneurs. You can find funding also for your business idea. You can exchange your goods and ideas with like-minded people.
Entrepreneur
This network is also for entrepreneur, you can create your company profile. You can embed video, maps and more on your profile. You can post products, services and events.
Incompany
incompany is a business social network and a business directory and online marketplace. You can find local business. You can interact with blogs, events and groups.
Ciozone
ciozone is for IT professionals. You can read blogs, join groups, participate in forums, meet experts and find resources and vendors.
Ziggs
Organize and connect with people in a professional way. Find and post jobs, create and join groups, list yourself in professional directory, find people and expand your network.
Loopthing
Lopthing is for both business and individuals. Business can get expose and increase profit. Individual can communicate browse and search.
Fastpitchnetworking
Fastpitchnetworking is business professionals to network and market their business. You can add value to your business.
Startupnation
startupnation is by the entrepreneurs and for the entrepreneurs. You can find free classifieds, forums, local groups, you can make business profile, and there is much more like, pools, guest book, events, podcasts, articles, personal journal etc.
Youngentrepreneur
Do not go on its name, here is everything for an entrepreneur of any age, forums, blogs, business advice and business coaching.
Topexecutivesnet
It is asocial network for them who focus on Business, politics and career.
Partnerup
I liked this network but it not available worldwide. You can join this network for properties, answers, businesses, opportunities.
Biznik
It is a dedicated community for entrepreneurs and small businesses; it says it is not just a LinkedIn clone. It is for business owners not job seekers.
Facebook
You should be thinking Facebook is at wrong place, it should be in professional network but I don’t think so.
Twitter
It is one more unbelievable place for Twitter as a professional network but I don’t think so.
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