[xw38011]

> What are better alternatives to LinkedIn, for people who want to get that rare serendipitous message from a recruiter?

The only one I know of is to have a personal social network of people who know you and are directly familiar with your work. Every rare serendipitous message from a recruiter I've received resulted from a referral from someone I directly knew.

But rare is probably the correct qualifier. I have 25 years experience, I've received four, followed up on two and only one resulted in me changing jobs. None came before I had 10 years of experience. YMMV