When you see sharebutton.to as a referral in your Google Analytics Panel. This might be referral spam, and it confuses and messes up your Google Analytics reports. The referral spam coming from different countries, for what we have seen its most of the time Russia, but other countries are also possible.
This referral spammers only target your Google Analytics reports and alter those in such a way that you think the visitations are coming from the spamming website. Actually this never happens, there is no visiting to your website, it’s Ghost Spam.