Addthis_widget detected as virus

We use sunbelts VIPRE enterprise systems, and I was alerted to almost every computer in the company having this and being quarantined.

Is anyone familiar with addthis_widget.js. It detects it as a trojan.js.redirector.bg , I'm not sure if this is a false positive or if it is actually a threat.

I tried googling it a few different ways but didnt find anything definitive. Does anyone have any experience with this?