Sometimes, yeah. Technology is one of them, and I have a fine memory for the impersonal details about people when it interests or benefits me. What instructors worked as previously, who knows what languages, etc. Never names, birthdays, or any "regular" stuff.
My problem has been more my learning styles and lack of practical application. A dozen Reddit threads about IT horror stories is insightful, but rarely translates to skill.
btbnnyr wrote:
Mine are useful.
I haven't been into anything as special interest that was really completely useless, I don't think.
Obsession over tv show appears pretty useless, but it did at least help me with writing skills when I posted on forums to talk about the show.
That's true, and it depends in part on the individual. Video games aren't necessarily useful, but if you enjoy socializing in MMOs you might become more comfortable talking to new people through it. Others could just take the negatives and feel worse about it.