It's the filter lists. Use the same filter lists with any other blockers which support ABP-filter syntax, and you will get the same result.
> named one of their assets file with social media names like "twitter/facebook/etc", it blocks the file right away
I have removed Fanboy's Social Blocking list from the pre-selected lists since a while now.[1]
I have to say that I had assumed -- wrongly obviously -- that all users knew that what is blocked or not depends completely on what filter lists are selected. So in your case it would have been a matter of un-selecting Fanboy's Social Blocking list.
[1] https://github.com/gorhill/uBlock/commit/ce04053ae3054ff287a...