Analytics Is Showing Pages On My Site From ******* and .snip.to. What is this?!

I was looking at my analytics to see what pages are most viewed and stuff and I have a bunch of pages on my site that I did not make. They look like this:

mysite.com/?from=http://snip.to/
mysite.com/?from=http://addddflyy/XXXmxr
mystie.com/?from=http://siteXXXXXXXX.snip.to/

And so on. There is a bunch of these pages that I am getting alot of visits to. And they are affecting my analytics as well. What are these? Have I been hacked? How do I deal with this? Help!

Referrer spam

Those are spam affecting your data. Add them to custom filter in Analytics.