Pluspunten
Plenty of chances to do what interests you, that can pretty much be anything in technology or gaming.. If there is a chance it can be successful then coworkers and management will likely support you. Everyone there is awesome and passionate about what they work on. Lot's of opportunity's to learn new and interesting things, you can pretty much take on whatever you want. Much of data mining that drives the various sites is always pretty interesting and something you won't find many other places. Was able to put some pretty impressive things on my resume and still occasionally remembering something I need to go back and add. Plenty of cool public and private company event's to go to, food is good (also usually leftovers if you want to take any home), good benefits. Random people will tell you how much they wish they could get a job here, you'll get used to it eventually.
Minpunten
Although this was worse before I joined, had slowly gotten better over my three/four years there, and significant company-wide initiatives I had pushed for where being lead by management to resolve this near the time I left, the infrastructure run's on blood, sweat, and tears (some sarcasm here, but not much). This was made clear to me during the interview so I'm sure they will let you know if and how much of this still applies. Random people will tell you how much they wish they could get a job here, it will take a while to get used to.