I don't. I wouldn't describe any of my friends as a 'best' friend and I don't think any of them would describe me as theirs either.
I have lots of friends - a few I've known since childhood, the rest I've made through studying, living or working together and, more recently, since having my child. These friends are spread all over the world too. The ones I see most are the 'mum' ones. My friends are almost exclusively female. A few are male but these were originally DH's friends who are now our joint friends as a couple.
Typical?