Related, albeit of a different nature, a pretty classic LinkedIn tactic now are connection requests seemingly from relatively attractive young women (at least when targeting men. A similar ruse is using age-correlated female from names when sending mass mailings -- instead of being from "Widget Co Promotions", it's from Brittney @ Widget Co).

Moments ago I followed one connection request I was sent, trying to find how I knew this person, to what was clearly a fake company with dozens of these "employees" -- all 20-ish, attractive women[1] with cloned profiles and fake backstories, to be shocked to find that many of them shared connections with me -- people I knew accepted the connection request because...attractive person. And this likely bot keeps crawling through the social graph building its master corpus of relationships.

To make it even more humorous, many of these fake profiles had various skills endorsed by seemingly real people. So not only did people connect with fake people on a picture, they felt the need to endorse them as well, earning their imaginary trust. Who knows...maybe it'll be the start of a crazy internet romance? Man and virtual bot.

[1] An interesting correlation would be determining someone's "type" from their online profiles, optimizing the success rate of the connection. Do they like the big haired blond? Maybe the petite Asian? How about the short-cropped strong-faced woman? A penchant for red heads?