We have had three occurrences of large numbers (220) of visitors arriving to our forum at the same time. The IPs seem to be from 'real' computers in that they are not yahoo or google spiders. These swarms are mostly from the US and not the Russian and Ukrainian spammers that sometimes hang around in much smaller numbers trying to get in. The first time they came to two threads and the last time (today) they came just to the forum index and stayed for 2 or 3 hours. Does this happen to others? What is this behaviour? Do I need to worry about it?
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