I think at the very least people should call to break up.

 ...

The poll revealed 48 per cent of under 21s and 18 per cent of 22-30-year-olds publicly dumped a love one in the last 12 months via the likes of Facebook and Twitter.

 

New singletons admitting sending an instant message or email or changing their Facebook status to a broken heart to signal the break-up.

...

 http://www.dailymail.co.uk/sciencetech/article-1142242/Faithless-Facebook-One-30s-dump-partners-online-social-networks.html