@travelplanet24 had the idea to ask users to come up with a catchy tweet that would be retweeted many times for marketing purposes. They were sucessful enough, since the majority of the greeks that I follow retweeted #tp24Lon almost making it impossible to read the stream that I follow.
I felt DDoSed and I objected strongly. I will not go into legal, technical and moral issues of what can be considered spam in a medium like twitter. I am simply one of those 45,7% users who use the web browser as their client and such campaigns, when successful, are annoying because of the limited (== none) filtering capabilities available from the web client. Unfollowing people to prevent this is just like disconnecting from the Net to stop a spam outburst. To be fair, of the people I follow only one more complained and a second one retweeted my objection.
What I find more interesting is that @travelplanet24 effectively managed to construct a retweet botnet where, in contrast to the usual botnets, the participants consciously retweeted the message. While the first time that such a trick is used may be considered successful, it may be a one time only stunt. With 45,7% of the users still using the web client, imagine two or more different such campaigns running at the same time. We need both a better web client and better standalone clients.
At least @travelplanet24 said that their next campaign, if any, will last less time.