Tens of thousands of Twitter users have retweeted a message claiming that Twitter will donate $1 per retweet to a baby needing treatment for cancer. Sadly, other Twitter users are helping to perpetuate the myth by retweeting it. Last week, a near-identical hoax spread between Facebook users, using the same photograph. And now the hoax is being spread on Tumblr too For every reblog Tumblr is going to donate 1 dollar, apparently likes dont count but im not sure.”]