I have recently configured LinkedIn in such way that I no longer receive any recruiter spam. The trick is to deny the "direct" messages from people outside of your network and also require a connect requestor to know your email. These two simple things (plus opting out of any of LinkedIn's mailing lists etc.) and boom! - serenity.
- The permanent "notification" that I haven't added everyone in my contacts to LinkedIn yet.
- it's much harder than it should be to just get to someone else's profile (or to your own)
- the never ending stream of connection requests.