Basically the interviews held globally were just almost similar based on what I've read here in Glassdoor. Phone interview - Group (they told you it was just a presentation about Meltwater however they 'judged' your personality and social skills during that day) - Group - Individual.
Tough interviews, you need to be very prepared. I didn't make it to the individual interview, but I feel awesome. The shortlisted candidates were amazing, while waiting for the result we had coffee between us and discussed about our career planning. Among 9, only 3 (I think) made it to the final interview.
One of must interviews that you should experience. If you don't mind to do cold-calls, work hard on sales.. you should give a try Meltwater.