FriendFeed runs a continous crawl, mainly of feeds. The user agent of our crawler is:

Mozilla/5.0 (compatible; FriendFeedBot/0.1; +http://friendfeed.com/about/bot)

We crawl from the following IP addresses:

38.99.107.138
38.99.107.139
38.99.107.140
38.99.107.141
38.99.107.142

38.99.68.193
38.99.68.194
38.99.68.195
38.99.68.196
38.99.68.197
38.99.68.198
38.99.68.199
38.99.68.200
38.99.68.201
38.99.68.202
38.99.68.203
38.99.68.204
38.99.68.205
38.99.68.206

38.104.134.98

If our crawler is causing any issues, you can contact us at bot@friendfeed.com, and we can turn it off or slow it down as quickly as possible.