I have approached the problem from another angle. My hypothesis is that social groups only form through continued joint experiences. The easiest way is to achieve this is go to regularly go to free events. I have build drop!in [1] for the event discovery and message your friends informally that you will be going.

Interestingly just a couple of day I wrote about the topic of loneliness in the modern age at my medium [2]

[1] http://www.idrop.in

[2] https://medium.com/@thisTenqyuLife/life-after-facebook-is-re...