Sherlock is a really cool tool which will allow you to span the internet searching for matching usernames. Say for example a friend’s username is test123, you could use Sherlock to see if they have created other profiles elsewhere. As humans, we often use the same usernames across sites.
This can be useful, especially when doing reconnaissance on a target.
To Install:
Git clone https://github.com/sherlock-project/sherlock.git
Cd sherlock
Pip3 install -r requirements.txt
If you were to simply search for a username, run the following:
Python3 sherlock.py [Username]
As you can see below, it’s found several sites which has the username test123
amoran.io 
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