Pros
Plenty of opportunity to grow within the company. The team is world-class, thus surrounding yourself myself with people that are good in what they do has been tremendously helpful for personal development. Benefits are great: free food, sport (gym), and a number of other perks. Another part that stands out is InDay where you get to work on a particular theme that is announced once per month. Some days it could be volunteering, another it would be to team up with a different department to craft something interesting which could potentially be a part of our site. A very positive vision in the company - just love the fact that we are part of it.
Cons
Throughout the time it does seem a bit that the company is getting the corporate feeling. We still are very much informal, but as we are fast approaching 5k employees around the world, it is getting more difficult to keep the culture and company with the "start-up" feel as we have been used to.