Senler is an equivalent of mailing lists that work on VKontakte. It offers the same goals and methods as email marketing, but adapted for the social network. Unlike email, this tool hasn't become commonplace yet, and it is currently in demand not only in B2B but also in social media. I actively use this service: I send notifications about upcoming sales, distribute discounts to specific groups of subscribers, and conduct surveys. When there are no special offers, I share links to useful articles in the group. This newsletter really works effectively. Since I started using it, I've noticed that sales have increased, and the reach of posts in the group has grown. The service not only justifies the costs but also brings in good profit.