Keeping a contingency plan in place before starting Twitter campaigns is necessary. The conversations on social media can go out of control. Here are some of the disasters that took place on twitter.

2. #McDStories
Idea:
Was to highlight good news related to the fast food chain
Disaster:
People used the hashtag to highlight their horror stories

3. #QantasLuxury
Idea: Was to gratify people to share their your dream luxury inflight
experience
Disaster: Unhappy customers started making fun of the idea of
#qantasluxury

4. #WaitroseReasons
Idea: Get people talking about
their brand by asking for
people to finish the sentence;
“I shop at Waitrose because…”
Disaster: Tweets making mockery
of the brand and positioned as
an upper middle class
expensive place

5. #SpreadTheCheer
Idea: Get People tweeting their ideas
and joyful experiences during the
Christmas season
Disaster: Bad practices of Starbucks
started flooding like tax violation,
ill treatment of staff and other
such issues

6. Thank You
http://www.telegraph.co.uk/technology/twitter/9034883/McDonalds-McDStories-Twitter-campaign-backfires.html
http://www.smh.com.au/travel/travel-news/qantas-makes-hash-of-tweet-campaign-20111122-1nsa4.html
http://www.eurekasales.co.uk/5443/did-the-waitrose-reasons-twitter-campaign-backfire-or-not/
http://mashable.com/2012/12/18/starbucks-twitter-taxes/