Actually, its not. Unless you're a Facebook addicted teenager it really isn't a big deal. I can easily kept contact with my family, friends and co-workers outside of China using email, skype, wechat and iMessage (since all company phones are iPhones), which is honestly the most important thing. Cutting back on social media hasn't been a horrible thing either. After having been here for a year now, I've found myself having a lot more time and I don't miss scrolling through the endless feeds of largely unimportant content, in some sense it's actually been liberating to be unable to access FB and youtube. I still have access to wikipedia, reddit, my local newspapers from back home, the internet radio stations I've been listening to for years, etc. All the top movie titles are still released here in China with english audio / chinese subs at about 8$ for an IMAX ticket. Alien: Covenant, Wonder Woman and Guardian of the Galaxy 2 are some of the movies I've gone to watch here in the last few months (release date somewhat the same as in the west), and older movies I can buy at the local market or online for 3-5$ incl. shipping. The few videogames I play have no problems connecting and VoIP applications like Teamspeak and Discord works fine in China. I'd honestly say that the most annoying thing here is that price discrimination really is a thing and that discounts are usually only offered when using the Chinese version of apps on the phone (e.g. about 30% cheaper to buy a bullet train ticket for Tianjin Beijing via the Chinese version of Ctrip app than the English one as the 5$ booking fee is waived).

Currently living in China as an expat and it's surprisingly easy to live with the level of censorship in place here. As mentioned by another, Google CDN is blocked which makes some sites inaccessible. The only google related service I've found to work here is translate.google.cn. The most annoying is aspect is not being able to search for things via Google, but having to rely on Bing or other accessible search engines. Almost all mainstream western social media are blocked, with the exception of LinkedIn which works without any issues. Non-western sites like vk.com seem to work fine. Most international messaging apps are also blocked in China, which isn't much of an issue since everyone here uses WeChat (or Weixin in Chinese) which serves not just as a messaging app and micro blogging service but also as a mobile payment platform with a plethora of integrated serves such as paying your utility bills, ordering taxis, buying train and flight tickets, booking hotels, etc. once you link a Chinese debit or credit card. It also integrates the option to have membership cards and related benefits linked to your WeChat account. That coupled with Skype for work-related video calls should cover most people's needs when here. Some news media (mainly American ones) such as bloomberg, wall street journal and the economist are blocked, while others like financial times, usa today, the washington post and los angeles times works fine. In the cases where you do run into issues, VPN services like ExpressVPN and Astrill VPN does the trick. Just make sure to get them before entering the country. Alternatively get the ExpressVPN plug-in for Chrome if that can cover your needs.