Facebook Reactions will roll out soon in the United States. Here's what it means for users, advertisers, and that mortuary school classmate you don't really want to be in touch with anymore.

In December, we started testing the ability for people to share live video on Facebook, and it has been inspiring to see all the ways that people have used Live to connect with their friends and family. Today, we’re excited to expand the ability to share live video to everyone in the U.S. via iPhone, and we plan to start rolling this out to the rest of the world over the coming weeks.

As part of Facebook’s ads there are options to target your ads towards certain groups of people, filtering by things such as age or gender. But there is another option in addition to this called Custom Audiences.