Startup Idea : Techbook

Facebook for Tech people. I visualized this: A friend of mine needs to edit a photo. He wanted my help. I said I would do it. But I was too busy. He thinks he can do it only with Photoshop. But, I know there is an online service, which is easier. He doesn't know what to search for it, in google. I wish there was a social network in which someone or the other would help him or make him feel good by suggesting a more effective and easier way for his problem. He'd get notifications when someone acknowledges, comments or does his work. :)