LinkedIn weirds me out. It's like there's a machine somewhere churning out bubbly young blondes and they all wind up as recruiters on LinkedIn. There was even one that billed herself as part of a combination job-search and matchmaking service: get an interview and a date! It's not surprising that some guys are getting confused, because there are users who are intentionally recreating an "enterprise" version of the thirst/influence dynamic of other social networks.
Baser dynamics are definitely not absent from LI. I've heard of salesmen creating catfishing accounts and boosting their response rates from executives. But that's also the seedy underbelly that's always existed in enterprise- tales of HR violations at trade shows and industry conferences abound. It's just more surreal or perhaps hypernormalized to see it in the clean, sterile, ostensibly professional world of a business social network.