I doubt that technology in general causes loneliness but there has been research showing that those who use more social media are more lonely.
I wouldn’t say technology is causing loneliness but the ways that technology is applied to social situations can cause loneliness.
For example:
I’ve been looking at the UK housing and transport data and comparing it against population density. One thing I’ve found is that communal transport is more correlated with population density than dense housing. For this reason I’d argue we don’t just wan’t to be creating more dense housing but reducing car dependence and improving public transport.
The PMCC(correlation to population density) of the UK data: