> Are employers getting access to search data today?
The more it's used, the cheaper it becomes to collect and sell. The issue is never about how it is used today; always about how it can be used in the future.
You can always find a way to work for yourself and avoid passing an employer background check. I'm more worried about political parties and private eyes -- blackmail, extortion, ugly divorce proceedings, etc. This can have a chilling effect on free speech and curiosity.
The Jacob Applebaum talk explaining linkability.[1]
Anyone who has access to any website where you logged into an account you publicly admit to owning can link your public identity to any private/anonymous persona, given another marketing data source. Verizon "owns the data", but not really. They are the original owner of the data, but eventually Expirion (target of the recent T-Mobile-Experion data theft) and the other credit reporting agencies will have your X-UIDH. Facebook, Twitter, and Google will know as soon as you log in once. They will be able to identify all of your accounts, perhaps even if you use a VPN.
As with any other high tech tracking, the average end-user is either unaware of the zombie cookie or unaware of the full capabilities of the linkability of it.
[1] https://www.youtube.com/watch?v=HHoJ9pQ0cn8