Two 2021 Ok.ru -

First, I should verify if there were significant events or developments at Odnoklassniki in 2021. Maybe the user is referring to two different topics or areas related to the platform that happened that year. For example, there could have been changes in user policies, security breaches, new features, partnerships, or legal issues. Another angle could be a comparison of two different aspects of the platform in 2021, like user growth versus data privacy concerns.