In some industries, job hopping is completely fine because of their nature and circumstances. But in my one, it is tolerated for those who are just new in their career, especially the newly graduates. In my field, the longer you are in your career, the more they expect that you to stay in a given company. Each companies in my field have their own quirks, so they appreciate people who stay on for long because they don't have to train new starts on the nuances (some companies backstab their long time employees, but that is kind of expected in any industry). Some might even think weirdly if you are doing some practices you picked up from your previous company (like reading the SOP). So, adjusting to new work environment can be daunting because different companies (in my field) do things differently.

I am a pretty sociable person. I consider many of my previous and current colleagues as friends, but they are different kind of friend, which is work friend. I would hang out with them and go for drinks or talk about things outside of work; but I won't share with them too intimate details of my life, as I do to my long time friends I grew up with.