Senler is an alternative to email newsletters that works within VKontakte. It performs the same tasks and uses similar methods as email marketing, but is adapted for social media. Unlike email, it hasn't become outdated and is particularly relevant for B2B, while social networks are great for B2C sales. I actively use this service: I send notifications about sales, discount coupons to specific groups of subscribers, and conduct surveys by sending out questionnaires. When there are no special offers, I simply share links to useful articles in the group. This approach is truly effective. Since I started using Senler, both sales and the reach of posts in the group have increased. The service not only justifies its costs but also brings in significant profit.