There are many resources which provide evidence-based information about loneliness and how to alleviate it. Here are links to some TED and other talks on You Tube, by Professor John Cacioppo from University of Chicago and others.
The Lethality of Loneliness by John Cacioppo
How to Cope with Loneliness by John Cacioppo
How to Practice Emotional First Aid by Guy Winch
The Simple Cure for Loneliness by Baya Voce
Other evidence-based information about loneliness is available from the resources published by the UK ‘s Campaign to End Loneliness at http://www.campaigntoendloneliness.org/resources/