It has become quite easy to find business persons online as they add their profiles on various social sites as well as on their own personal or business websites. If you are looking for someone named Amit Raizada then using Google, you could be finding all websites that carry information about him.
Sites like Democratic Underground tend to publish news items relating to individuals that enjoy popularity in certain fields and you could be finding information about them through these types of sites as well.
It is therefore wise to try multiple websites out when seeking information about anyone on the internet. Relying upon a single website may not give you the kind of results that you may be after. If you read information about a single individual on multiple sites then you could be getting additional details from one site or another.
To get a list of all sites that carry information about a topic of your interest, then simply use search engines as any keyword you search for will return relevant pages that would be most appropriate for you to visit. You can also try social sites and search for individuals by their names as this way, you could quickly be accessing basic information about them. The advantage of social media is that you could be following people and getting daily updates about them.