What does a wink, like or match mean?

Like & Match
You only see matches when there is an actual match, thus a like from both sides. In order to turn this like into a match you must like them too. There will be no matches if you do not like any of the people that liked you.

People who liked you will appear random but with priority on the wall.

In contrast, you can send a wink to show direct interest in another member, who can see the wink.