Forwarding Islaamic messages via mobile phones

In this present time of ours, and in particular [I wish to ask about the issue related to] mobile phone messages (SMS, WhatsApp etc.) which we receive quoting ahaadeeth, and at the end it states: ‘Forward this message, and you will be rewarded in like or more [plentifully]’. So what is your opinion regarding forwarding some of these ahaadeeth, particularly since we do not know their authenticity?