[kosei]

Yep. Endorsements are very clearly built as a LinkedIn engagement and retention feature.

[hvass]

I think people are able to endorse you for anything. The more keyword-rich a profile is, the better targeted the advertising. ;-)

[RegW]

Yes. Endorsing your friends for the most bizarre thing you can think of, is always great fun.

Never accept an endorsement for anything boring like work.

[jlarocco]

My favorite is "Problem Gambling." I don't even know why it'd be in their list of endorsable things.

[gergles]

Counselors can specialize in treating gaming addictions.

[corin_]

I'm gay, and a friend and former colleague went through a period of regularly endorsing me with anything that sounded at all that could sound either camp or gay. I can't seem to figure out how to find them now, and off the top of my head the only one I can think of is Pearl (I'm not a programmer, and I doubt he even knows Pearl is there as a programming language). Meanwhile I'd return the favour with anything that hinted towards the fact that he's a massive pervert.

Was great fun for a while, and the only use I've ever had from endorsements, which I've now completely disabled.