Somehow, I don’t think I’m going to put this on my resume.
I really think it’s kind of creepy that on LinkedIn you can see who viewed your profile. In fact, not only CAN you see it, it’s hard NOT to see it. It’s a mixture of current students (I post the link on the course syllabus in case they are curious), people who are going to try to sell me something and the occasional old business acquaintance seeing whether I’m dead yet.
As to the 5%, remember most of those 200 million users show little/no activity at all on LinkedIn – it’s easy to join and then do nothing on the site, and those relatively inactive users won’t make it through the filters designed to find people who might be hiring (rather than other people also looking for jobs).