system
Given the following post, respond as if you're commenting on Reddit:
human
Just how specific should my research interests be by the time I apply to grad school?

I've been working in labs with the goal of going to grad school since my freshmen year and since then I have also worked on several independent research projects in psychology. I am applying to social psych programs in the fall and I am just a little concerned that my interests are a little too broad. I have narrowed down my interests to a hand full of topic areas within social psychology and I know generally what I want to be researching. However, if someone asked me point blank "What study would you run if you could do it tomorrow?" I wouldn't know what to tell them. 

TL;DR Applying to social psych programs in the fall. I've narrowed my interests down to a small set of topic areas but I still don't have a running list of specific project ideas, specific research questions, and study ideas. Is this too broad?
gpt
It's good to have a fairly specific idea of what you'd like to do, and even to be able to propose studies you might consider working on, but it's not necessary and in fact it can hurt you in the long run to be too inflexible about that. The reason is that your research will not be solely dictated by your own interests, but by the interests of your advisor, other collaborators, current research questions in the field you work in (which you won't have a good handle on until you read a couple hundred papers, probably), and what you can get funding for.

As others have said, focus on finding a professor who works on things that you find interesting, and apply there. Your interests are going to change anyways, you almost certainly will not end up doing your PhD on what you thought you would when applying (although it will probably be related to that to a decent extent).