Softsoilder, it is a bot, but it's not a spam bot.
It's a crawler, or search-bot (from google in this case, hence googlebot.com). It adds the latest stuff to Google's search engine. There are bots from Yahoo and from the advertising company ForumUp uses as well.
It is not 4 of them (unless you see another IP as well), it is just that they move so fast that the statistics function can't handle it.
If you see that a crawler is reading PMs, or posts in hidden forums, according to the list in the Admin panel. It is not the case. It can't get further than the log in, just like any other guest. The bots "click" every link, but they
cannot get into password protected areas.
So, those bots are quite harmless and friendly...
FoxLeonard