Facebook announced today that they have rolled out reactions to everyone. It may take some time to get used to but you can now love, haha, wow, sad and angry a post. 

Reactions came from a huge amount of requests for a dislike button, and I think Facebook made the right decision - sad and angry are somewhat not so negative as dislike could potentially be. Emotions will work better in this instance.

Unfortunately Facebook won't yet be offering any special ad targeting capabilities based on how people react to posts. The data on which reaction someone uses most frequently could be valuable to advertisers looking to finely target their messaging. I think in the future we could well see this being implemented.