Do I need a website and social media when I start querying?

I've seen agents say that they Google potential clients, and that authors should have websites when they query. Some agents also say social media is very important, while others don't seem to care as much about that. I'm not at the querying stage yet, but I figure if this is important it can't hurt to start learning now.

Thing is, I don't know if I want to start a blog. I haven't ruled out the thought for the future, but right now I don't think I would have much to say on one, and I don't want to blog just for the sake of it. I think a blog is far more likely to succeed if you're actually passionate about it. At the moment I'd rather devote my energy to writing novels, not blog posts. The same goes for Twitter - I'm not sure it's something I'd enjoy and use often enough to get real value out of it. The only social media I really enjoy is Tumblr (which I use for totally non-writing things), but I don't see that as a site that's as well-suited to networking as Twitter or a blog.

Is it going to hurt my chances if I don't have an established web presence when querying? (I write fiction, not non-fiction.) And if I'm not blogging, what things would an agent be looking for on a website, and when they Google me?

Do I need a website and social media when I start querying?