There are Quite a few social media sites that you could use to find people who you may be looking for. All sites work differently depending upon their target audiences. Normally, when looking for professionals you will find social platforms like LinkedIn to be the best ones to use.
This is because the vast majority of professionals would have their own profiles published on LinkedIn as opposed to other social media sites. But if you simply know someone by their name but you are not sure of their profession then you could get started with Facebook which is also one of the most popular social media sites that is relevant to everyone regardless of their location or profession or even age.
Therefore, if someone recommended you Dr Omarjee for example and you would like to dig up further information about him then you might want to try out both Facebook and LinkedIn. In order to be able to find someone on either of the social media sites, you will have to create your own accounts first.
Chances are that you may already have accounts on atleast Facebook as every other individual seems to have a Facebook profile. The best thing about social media sites is that they can be used using your mobile devices so it is not at all dependent upon your laptop or desktop system in order to be able to find people through your account.