shaselai
i dont hear much from linkedin people at alll...
It probably depends a lot on your current job, your profile's completeness, your 'groups', and what your profile settings are.
If you want to have more exposure to recruiters, make sure your profile includes details about your role and functions at your current job, that your profile indicates that you're open to job inquiries, and consider joining a group or two that have active members that's relevant to your industry or where you want to go. To the extent that you can contribute to group discussions, doing so will dramatically raise your visible profile.
It's been a really great tool for allowing other people to buy me coffee or lunch on a semi-regular basis

While I'm on a specific contract right now, I maintain good relationships with recruiters who contacted me via LinkedIn, and forward their job opportunities to people I know are looking. If I ever decide to jump ship, I hope that those recruiters will be putting in a good word for me.