text: Tweeters have been using #NoToSocialMediaBill to campaign against the proposal.
  It proposes up to a seven-year sentence or $25,000 (£16,000) fine for anyone found to be sending "abusive messages".
  Human Rights Watch condemns the move as an attempt to muzzle free speech.
  Millions of social media users in Nigeria, as well as those sending text messages, could be affected, it says in a statement.
  The bill does not define "abusive statement or messages."
  There will be a public hearing on the bill before it can be passed.
  Activists see the bill as an attempt to target critics of lawmakers and politicians.
  The BBC's Nasidi Adamu Yahya in the capital, Abuja, says Nigerian MPs often come under the media spotlight because of the huge money they earn.
  However, Senator Bala Ibn Na'allah of the governing All Progressive Congress, who sponsored the bill, said the publication of false stories was becoming rampant in the country.
  "You can't write false stories just because it is social media," he told the BBC Hausa service.
  The offences the proposed bill seeks to criminalise already exist under Nigerian laws including those on treason, defamation, and libel, our reporter says.
  Nigeria has a vibrant civil society, with many activists who use social media for their campaigns. It has the largest number of mobile phone users in Africa.
target: Nigerians have been reacting angrily to a draft bill being discussed in the Senate which aims to punish anyone who "propagates false information" on electronic media.