One way to check the reliability of the website is to look at the type of payment they ask for when you provide any information on the website. Reliable websites will not request any fee before providing the information. On the other hand, if you have to pay to extract the information, this is not a reliable service. The websites that claim to offer the ability to extract email address, phone numbers and other relevant information do not have these capabilities. You should avoid these services and look for a website that provides all the capabilities that are required to conduct a successful LinkedIn research.
Another aspect of the reliability of the software is to see whether it allows you to search windows on LinkedIn. In this respect, you will be able to extract information about people who are in your network. If you are an entrepreneur, you will be able to search windows of people who are linked to you. If you are a member of social networking sites like Orkut, Facebook and MySpace, you will also be able to perform LinkedIn research. To make the most of the tool, make sure that the software has the capability to capture phone numbers, email addresses and other relevant information on people who are in your network.