Greenpeace recently protested outside Twitter's headquarters in San Francisco, asking the social network to make its tweets green.
Greenpeace, the watchdog environmental group conducted a research 'Clicking green' according to which Twitter got F's for "energy transparency," "energy efficiency and mitigation," and renewable energy deployment and advocacy,"
Meanwhile it got D for "renewable energy commitment and siting policy."
PT. Gary Cook, senior IT analyst at Greenpeace said that it was a 'friendly' protest and was about demanding a commitment from Twitter to use 100 percent clean power, Cnet reported.
Twitter spokesperson Christina Thiry said that the social network welcomes any constructive feedback that is directed towards greater efficiency of operations.