Russian hackers hit Twitter with automated hashtags tweets to hamper opposition activists. The pro-government messages were generated by thousands of Twitter accounts that had little activity beforehand. The accounts were also all created in July of this year. Social networks are becoming an increasingly important stage for conflict between governments and their people. Getting the software for such attacks isn’t that hard, about $150 one can get the automated Twittering software, and a “Twitter blasting machine” totals about $300. The hashtag is # (Triumfalnaya), the name of the square where many protesters gathered.
Source: https://thehackernews.com/2011/12/russian-hackers-hit-twitter-with.html