I really hate it when tools use such underhanded techniques, but I get it from a business point of view.

Especially social apps like SocialCam need to become the biggest network in their space to succeed in the end. Being number two in the social space is a far worse than in any other market because of network effects.

It's probably worth offending some users and even loosing some. Especially posting it on your wall, when you click on it, is something that most users don't care about. I've asked some of my not so tech-savy friends and they think it's totally okay.

Something that doesn't work at all is posting something without any action from the user or from a different source than their facebook timeline (for example from an mobile app) without their consent. This can kill your product and will upset nearly everybody.