According to anecdotal evidence (and an unofficial Twitter survey), some individuals wait until they've been seeing each other for one to three months, or until the relationship is considered "exclusive." Others say it can take as long as a year. Instagram's product team doesn't publicly discuss when users start receiving notifications about new posts, but we do know that there are approximately 20 people on the team and an average of 1 million new photos being uploaded every day. That means that someone has to review each photo page by page to make sure it isn't violating community guidelines or isn't infringing on another person's rights. In addition, employees work through personal issues such as breakups, marriages, and births, which means that some people may not have seen other members of the team in a while while others go days or weeks without hearing from anyone else at Facebook. When Facebook acquired Instagram for $1 billion in 2014, many people wondered why Facebook would want something so small. The answer is simple: People use both Facebook and Instagram to share pictures of their lives, and by combining the two services together, Facebook gets even more access to this information. By integrating the services well within the app, Facebook avoids changing things around too much for people who use both platforms, which helps them retain users.