The invite email I got looked like spam since it didn't tell me who added me or what had been added. I didn't even find this out after visiting the link. I had to create a full profile to see that the JSConf guys had done this.
I'm glad I took the chance, but I'm sure other people are just filing it as spam since it reads exactly like the "Someone has a crush on you; click here to find out who!"
Looks like a great site though!
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