Currently, iMessage users can apply animated effects to chat bubbles, as well as send full-screen effects. For example, you can momentarily fill the chat screen with floating balloons. However, Apple ...

Spruce up your texting with iMessage effects. With Apple’s text message effects, you can make quite an impression. You can make congratulations more bombastic (to rejoice in someone’s finest moments).

Enabling read receipts means that the person you text can see when you've read their text message. This, obviously, has pros (transparency) and cons (you look like a jerk for not responding right away ...