The nomadic thing! Used to do something like that with random Internet forums, it was great fun :)

We had a small group of friends and/or religious zealots (Discordians) from all over the world, and we'd pick a medium-smallish webforum on a random topic and we'd go on safari. Dress up our avatars with little pith-helmets, register an account and uh, explore the local wildlife.

We didn't really try to disrupt or actively troll anything, just have a bit of fun and, well, basically we'd roleplay stereotypical Bri'ish explorers and I dunno it was hilarious :-)

Reactions varied widely. Sometimes moderators just got spooked because five new accounts registered all at once and they were acting silly and it looked like a troll invasion (but we were always nice and polite and we offered them tea) depending on their sense of humour, sense of adventure, sometimes we'd get banned within minutes, otherwise we'd hang around for a day or two, check out some discussions, actually being helpful if we could, just play in the "general discussion" sub or photoshop some pterodactyls on their memes. The better forums really got in on the joke, great times were had, and occasionally some of their forum members joined our little band. If we didn't get banned, we'd try to leave a link to the next place we would explore.