I think a lot depends on how we define 'popular'. I remember two girls at primary school who were popular in the sense that lots of other girls wanted to play with them at breaktime, invited them to parties and so on. The thing was that nobody liked either of them. They were horrible bullies, and people were basically afraid to get on the wrong side of them. They were on-and-off friends with one another, and we would often get to school to be asked 'whose side are you on? J's or B's?' and we would have to pick a side. Then the girls would 'make friends' again, claim that one had apologised to the other, and ostracise the ones who had sided with the 'wrong' one. At 11, one of them went to private school and the other was left without her sidekick. Her 'popularity' was shown for what it was then.
I think that a fair number of 'popular' people are a bit like that one way or another. Yes, there are those who are easy to get along with and don't have many people who 'don't' like them, but on the whole I think that most people have a few friends, a few more acquaintances and rub along (or not) with everyone else.
I was like that - I had a few friends throughout school, and a wider circle outside of it. I was always 'willing to speak my mind'?, which made me both friends and enemies depending, but I was never bothered about that either way, really.