You can "stumble" across sites based on your interests, and you can give them a thumbs up or thumbs down to let StumbleUpon know what you do and don't like.
Ị nwere ike "ịsụ ngọngọ" gafee saịtị ndị dabara na ọdịmma gị, ị nwere ike inye ha mkpịsị aka ma ọ bụ isi aka ka StumbleUpon mara ihe ị na-eme ma ghara ịmasị.