Another social network, that is sadly gone is known as Qoorio. It was created as a social networking for advisors and lifelong learners. The main idea, behind this app, was for people to share ideas and perspectives. If my memory serves well, people would create an account, with approximate location. After that step was done, they could set up rates, for consulting fees. Of course, if someone wanted, he or she could provide consulting for free. However, the main point was to meet face-to-face, since there were no virtual meetings. For this reason, people had to provide their approximate location. Of course, other users, could review them, and follow them.
Sadly, this app did not gain popularity, and in the European markets, it was barely struggling. I did create an account on this app in November of 2021, when it was near the end of it's existence. It went out of business in December of 2021.