Easily use Google to search profiles on professional networks. Also optimise job ads by using the 'Job Ad Optimiser' to suggest skills and synonyms.
Build Google searches in any combination of Google or Yandex supported top level domain, country and language. A tool for International SEOs.
A Stack Overflow-like style advice social network. Users posted their pictures and other users would help them with their style.
A native Facebook financial comparison application and affiliate site. It turned out that most people don't want their personal debts posted on Facebook 🤷♂️. The affiliate site worked pretty well though.