At the end of March, Facebook announced that it has 1.11 billion monthly active users. eMarketer found that only 889.3 million of those users were humans.
Facebook is aware of the issue and knows that some of their user estimates may be inaccurate, according to a report filed to the Securities and Exchange Commission in June 2012.
In 2012, Facebook estimated that 1.5 percent of Facebook accounts are “undesirable” or spam accounts. A lot are just accounts for users’ pets. People have been making Facebook pages for animals for years. CNN wrote about the trend back in 2010, estimating that there were “at least a few thousand profile pages for dogs and cats along with less common pets such as birds, hamsters, ferrets, turtles, fish and rabbits.