Happy hour specials are $1 off drafts and half-priced appetizers.
Try the calamari, it's got a funky sauce but really tasty.
Olive or Twist is usually really crowded for HH on Fridays, which is when my work crew usually rolls in. I've only been here once during a non-friday HH, and it was much more enjoyable. The food has been hit-or-miss, but I have generally been impressed with the apps.
I gave this place three stars because of several things. I've tried a lot of beers here, but I often get them with a glass of 'funk.' They need to clean their lines more often to get rid of that taste, and drop the price a bit; this is Pittsburgh, not Boston. Martinis have been hit-or-miss; they've done an excellent job on the dirty Ketel One, but some of the girls have gotten foo-foo drinks that have been undrinkable.