Hi Wilma
We did talk through the suggestion some time ago. Rest assured, we do take requests like this seriously - it's just not always possible for us to go ahead with them unfortunately.
In the end, we decided that a like button also had the potential to upset people too, say, if their post wasn't liked at all. That, combined with the amount of tech development it would take to create it, means that it's not something we're implementing at the moment, sorry 