I don't disagree, and at least there was a checkbox, but blaming the user for what's at best a UX issue and at worst an abuse of trust doesn't bode well for a new service.
Moreover, they're asking users to make a decision about whether to promote their service without first using it. I think you'd get more engagement if you populated your timeline and there was a message that said, "Hey, isn't this cool? Let us know what you think, or tell your friends about it. Thanks for using <SERVICE>!"
