Is there a way to flag a question so it is easy to find later when it has been answered?
Since each question has a unique URL (web address), perhaps this is best done using bookmarks in your web browser.
I was wondering this too, but it should be easy enough to set up a group of Socratic bookmarks in your web browser.
If you use multiple computers, then there are various ways to synchronize bookmarks between them. I personally use Xmarks, but there are several alternatives.
Actually, I think there is!
This a little overdue, but I just remembered seeing your question on the Meta page some weeks back and I figured I'd share my two cents.
You can actually "flag" a question, so to speak, so that you can get a notification email when an answer gets posted.
To do that, you need to request an answer for that question. The red heart that acts as a "like" for an answer, acts as an "answer request" for an unanswered question.
Here's a fresh example
Notice that Gio asked the question yesterday, and that Trippy requested an answer 14 hours ago. The red heart indicator shows
Now, when this question gets answered, both users will get a notification email from Socratic.
So if you want Socratic to let you know when a question is being answered, request an answer for that question and wait.
At least that's how it should work! :D