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It looks like the IPv6 address of the machine that connected. It is made up of eight groups of four hexadecimal digits. You can search for the owner of the network and inform the ISP of that network. There are many but http://ip-lookup.net will search for info about IPv6 addresses. Update: I ran a lookup on my own address and got better results with ...
It can be that he viewed your page or that you have some mutual facebook friends. Like old highschool/college friends or other people. Also the question you're asking is not relevant for this forum.
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