tribalfusion.com - Good Cookie or Bad Cookie

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I keep getting a cookie, which I don't recognise, come onto my PC every time I log on to myLot. Whilst I am aware of myLot's own cookie, and one other which they use, this 'tribalfusion.com' has got warnings about it all over the place. I went into a web search to look for info on it, and, apart from specific listings about it - carrying warnings, my own McAfee SiteAdvisor shows this cookie as an amber warning. What am I to do? I keep deleting it whilst in myLot but it comes back. Does anyone know its function? or do I have no need for concern?