I haven't updated mine in several years, especially employment history (this one step reduced recruiter spam for me to almost nothing). I use LinkedIn entirely

I haven't updated mine in several years, especially employment history (this one step reduced recruiter spam for me to almost nothing). I use LinkedIn entirely as a "research tool" to find connections into companies, or to keep up with previous coworkers current employers. I only accept invitations from people I (a) know personally, (b) have done business with, or (c) see a potential business relationship evolving. I recently registered a domain on GoDaddy (I know of all places) and within 12 hours had over 30 requests on LinkedIn from developers looking to sell their services to me. If anything it is a good upsell for GoDaddy by forcing your hand at WhoIs Guard. Similarly it does seem that installing the LinkedIn app on your phone spies on who you call/contact/look at online which translates into recommendations. A few months ago I had someone give me their business card and I called them the next day to follow up. I had not entered any of their details in my contacts or emailed them prior. After the call I went to connect with them on LinkedIn and sure enough the first person in the "People You May Know" section was this person.