Nothing to worry about. It's just for targeted advertising. I'd be surprised if you haven't got another 50 by now 
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Now I know precious little about computer security weaknesses, but I remember reading that 'cookies' are low risk
provided that they cannot be accessed by anyone other than the organisation, (whom you have to trust), putting it on your computer when you visit their site/s.
Internet criminals are known to aggressively target employees of all suitable organisations with large rewards for passing on security information, and I would have thought that giving access to 'cookies' info. would be one of the simplest ways of enabling them to monitor and possibly take advantage of your internet practices. So perhaps they aren't as harmless as they are made out to be.
I may be paranoid about it, but I run a Norton full system scam, at a suitable time in the evening, every two days, which takes three hours. I also scan on start-up with XoftSpySE which takes about four minutes but identifies between 10 and 20 'cookies' each time, which I then delete. The full Norton scan only ever identifies one 'cookie', but it has cleared more malicious stuff on occasion.
As I have online bank accounts I am prepared to accept the possible slowness of certain processes to enjoy what I feel is greater security.
No doubt someone will tell me that's OTT, but it makes me feel comfortable.