The obsession differs between the three tho
for Geeks, they're obsessed with games (D&D or Minecraft or whatnot, but usually D&D)
for Nerds, they're obsessed with maximizing their intelligence (not IQ, that's how fast you can gain intelligence.)
for Stalkers, they're obsessed with a cheerleader who's not too popular but still pretty
OH, and the more socially awkward dorks and nerds are quiet kids