Lots of tools can scrape members from VKontakte groups. That's easy. But here's the thing — a group about pregnancy might have members who joined 5 years ago, and their kids are already in school. Not exactly your target audience for baby products.
Targetolog solved this by tracking who just joined a community. Every day, the system compared membership lists and identified new arrivals. Fresh audience, fresh intent. You could target ads specifically at people who joined a pregnancy group this week — meaning they're actually pregnant right now.
The system ran daily scans across configured VK groups, generated audience files, and uploaded them directly to VK's retargeting cabinet. Every morning, the client received an email with a full report and a short summary — how many new members were found, audience files attached.
This was particularly effective for niches where timing matters: pregnancy, weddings, moving to a new city, starting university. The difference in ad conversion between "joined today" and "joined years ago" was massive.
Built as a Node.js backend with VK API integration. The whole thing ran automatically — set it up once, get fresh audiences every day. Simple idea, but it made a real difference for ad targeting in 2016.