LinkedIn’s online job application has a little issue: there is no reason to provider a user with three confirmations after submitting an online job application. The user task is complete and it says so in the Web page with the application information. That is sufficient notification. LinkedIn adds a second confirmation with a pop-off.
The second confirmation is not necessary because the first confirmation was in the application page. Below the tags, there is text with a check mark that says: Applied 39 seconds ago, See application.. 
LinkedIn doesn’t stop there, it also sends a third confirmation by email.
One completion notification is adequate; the rest are redundant and time-wasting.
Some people might try to argue that the user might be able to turn off notifications. However, there is no reason for multiple notifications in the first place. Or is there? Did LinkedIn deliberately use three confirmations in order to try to promote their Premium service? It appears maybe they did deliberately design triple notification with upselling in mind. If they did, that strategy could be seen as user manipulation.