I'm sorry but this is not planned in near future. This is not an easy task, it requires forum visitor IP and cookie tracking system to keep the liking action secure and prevent multiple liking.
The website I have, in the main provides information, It needs people to help provide that, but it is not something that I would expect to get a lot of posts from one person. I would prefer that people just gave the information without bothering to register, however at the moment guests cannot comment so I am using a contact form. The reason for the "like" is just so we can see which are the most popular places. I know this seems vague, so please have a look at the site wateratairports.com