1) Likes System - Pretty simple and straightforward. At the bottom left of each post is a LIKE button. Click it to like. Click it again to unlike.
2) User Tagging System - You can now tag other members in your posts simply by placing the @ symbol in front of their name. Why is this important? Because they get an alert that they were tagged and can go and see what you had to say and respond. Tagging also creates a link to that user's profile page so you can also use it to refer one member to another without them having to go search through the member list!
This is a small but great little tool for increasing communication here on the site and we hope you will use it!
PS - Sadly, this isn't quite as advanced as Facebook's tagging and won't auto-suggest names for you just yet, but it is our understanding that this is in the works!