I interned at Yelp in Winter 2018. Yelp has a really solid internship program. They really try to give the interns the best experience with weekly events. It helps to have a smaller intern group in the Winter term because you can really get to know everyone.
In terms of actual work, I mainly got worked on their backend APIs and business logic. Nothing too challenging, but still pretty fun. The mentorship I got from my mentor was exceptional, but this is very team/mentor dependent.
The culture at Yelp is definitely one of its major perks. Everyone is super nice and chill, no overtime expectations.
The salary was 8000$/month with a 1500$ monthly stipend.