I actually think this feature is worthwhile in some respects.
I'd like to be able to share some of the funnier threads on here with some friends. I've often maintained that this place is the 4chan for people that make money...
I've only got two real issues:
1) People may socially bookmark some of the better techniques that get shared around here - This means that those techniques will get out in the open, so not only will the person that came up with them get less credit or even no credit at all, you're also going to have a whole heap of douchebags using the method, and for those too dumb to get it working right, they'll sign up and bitch and moan about how it doesn't work