Periscope is a ton of fun to use, and I've had some wonderful experiences. The problem here is that it will be the first time a lot of people do livestreaming. Coming in and seeing these obscene comments is unsettling and certainly makes it harder to do the next stream. Think of those who might already be targeted for harassment, of voices that might be underrepresented, and make the tool more welcoming for them. This will not make the app unusable for others, rather it makes it a better experience for everyone.