Meta Intern interview questions

Was emailed promptly by a recruiter, who arranged everything. Had one phone interview. Interviewed for the grad-student-level position of "security engineer intern", which I assumed meant more along the lines of network and system security and less along the lines of web security, which is cool but not my area.

The interview process consisted of a 45 min interview with one of the dev on campus. It was a technical interview with focus on data structures like tree and algos related to the same. I was asked to print all the nodes of a tree in order. Basically an implementation of BFS and then was asked to print the tree as it appears with correct new line characters making it appear as a tree and then further was asked to modify the logic such that the nodes are indented to make it look exactly like tree(we see in all the DS books)