I applied online, having to give a reason how Twitter has transformed modern journalism. (I am personally a bit skeptical of relying solely on Twitter for anything, but wanted a year or two experience of it to build my SOCMINT.)
I got an e-mail requesting a telephone interview. Following that, I was told later that I was passed on to another telephone interview with the person, I assume, I would be reporting to. Following that interview, I was brought in on-site for an interview with three people.
Having a background in government, you have to quickly assess a situation. I can't say exactly for someone else not to work there, but the moment I walked into the lobby, I knew it wasn't for me. It was a bit superficial, the receptionist took forever to let me sign in by a tablet, and I see warning signs when a company brags about the free lunches and benefits. I don't have a journalism background, but I do have a more direct approach, so I as I sat in the interviews, I could see potential personality clashes. But, again, this is my personal impression.
The questions primarily asked about my background and the interviewers were related to hypothetical situations and how my experience or opinion would be applicable in the work they do. I listed some of the questions in the IQ section. It was a bit of a rotation of interviewers. So, obviously, you will be presenting yourself multiple times.
If an interviewer is blatantly rude, I have, in the past, immediately written to them to remove my application. Because they were nice, I was polite as well but hoped they wouldn't contact me back. The only real negative remark I can say was the HR rep intentionally wanted to call me to tell me they wouldn't be making an offer. My suggestion would be to read people better, as an e-mail would have sufficed. It further confirmed my suspicions not to work there, but I don't burn bridges.
It was an interesting experience but I had already accepted an offer in my field which previously used Dataminr as a content provider. The interview process gave me a better idea of their product.