Socinator gives you an ability to search the Linkedin user with different query type.
Below are the available users queries for Linkedin in Socinator.
Someone Posts(s)- With this query type, software searches post from Linkedin with the entered profile urls. and get the post who are posted by profile URl.
My Connection(s)- With this query type, software searches post from my connection's post of linkedin and and get the post that are posted by connection