Wired.co.uk has recently published an article on business networking. Due to the Internet’s ability to connect people from all over the world, over recent years, business networking websites have grown. The biggest is LinkedIn, which has more than 100 million users, but it is not the only one. Here you can find another four useful business networking apps.

LinkOut is an app to turn virtual meetings into real-world ones using *LinkedIn*’s API. You register your networking goals, along with times and days when you are free; then, LinkedOut searches for calendars and LinkedIn networks and matches the right people at the right time.

Sonar is an iPhone app which tells you which of your contacts on Foursquare, Twitter, Facebook and Linkedin are in a certain place. This way if you are at a party or a conference you will be able to quickly and easily find who you want. Your connections don’t have to be using Sonar, but they do need to check in with either Foursquare or Facebook places.

The CrowdedRoom app helps you understand how you are connected to people near you. It is similar to Sonar, but it finds people with common interests by retrieving data from Facebook profiles. Another interesting feature is the “might go” status, meaning that a person can express their intentions to go to a particular party/venue so that others already there can persuade them to come.

Ndoorse is an exclusive professional network that you can only join if you have received a recommendation. It organises offline networking events for its members, a select group of business networkers and headhunters.