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I currently have 10 people viewing my forums. One is me, the other 9 are TrendMicro. Why are TrendMicro, an antivirus maker, wasting my bandwidth? If it's for a valid reason, why would they send 9 of them?
Well, with SMF you can click a magic button that tells you their IP, and from the IP you can find out their location and their company. They are all definately TrendMicro, or from the same IP... or using their IP's.
Sounds like bots just gathering information. I'd ignore them unless they start posting or anything. They'll probably be gone after they have what they want and won't show up again.