Childhood friends keeps adding you on different social platforms after having a falling out a decade before?

I had a childhood friend who I haven't spoken to since high school over a decade ago. A few years ago I saw that she friend requested me on my rarely used Facebook and I accepted her request. I also have a private Instagram account and she's requested to follow me on that as well. I find it odd because me and this friend had a large falling out in high school with me choosing to end the friendship. Although I wish her well - I don't really care to be in touch or follow her on socials. I find it odd that she is adding me on several social platforms- am I right?

Childhood friends keeps adding you on different social platforms after having a falling out a decade before?
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