BeKnown is an effort to replicate this growth while offering clear ways to ring fence professional and social networks.

FORBES: Monster's BeKnown Stalks LinkedIn On Facebook

Electricity supplier Central Networks has advised customers to ring 0800 328 1111 to report loss of supply.

BBC: NEWS | UK | Water runs out in flood-hit areas

Users can be logged into the service on up to five devices at once - meaning all will ring if they receive a call - including handsets using Sim cards associated with different networks and internet enabled gadgets such as iPods.

BBC: O2's Tu Go aims to challenge Skype and other Voip apps