I have taken Data Privacy course and as a project we scraped LinkedIn for "people also viewed" part. Some of the LinkedIn profiles had Twitter accounts linked a

I have taken Data Privacy course and as a project we scraped LinkedIn for "people also viewed" part. Some of the LinkedIn profiles had Twitter accounts linked and by traversing those accounts and their connections we were also able to identify the Twitter handles of Linkedin users that did not list it, even by using simple string comparisons and text similarities. So, cross-referencing works even for a simple stupid like this, imagine what people can do with advanced methods.