Pen pals. It has become a bit of an old-fashioned term, now that you can interact with most people online or texting. Even email's a bit old school these days, with Facebook and messaging popular ways to talk to family and friends new and old.
But not everybody's online - and I'm not talking about your nana and grandad (who may well be).
Reports this week that prison inmates were entering the online dating sphere on a Facebook page have stirred up a storm of controversy.
The page, Prison Pen Pals New Zealand, was set up in August last year and has been publishing "pen pal profiles" from inmates.
Prisoners don't have internet access - they need to pass their details via hard copy through friends and family.