Celebrities and companies were almost universally annoyed to discover their Twitter accounts were being bombarded with messages by activists seeking an end to Japan's dolphin hunts.

Starting Sunday, more than 100 tweets were sent out to each account and then retweeted by activists and supporters. The so-called tweetstorm messages included the hashtag #STOPdolphinhunt (in Japanese) and asked account holders to retweet the messages, send them to celebrities and join the campaign.

Targeted celebrities were less than welcoming.