Basically, It would work like on Xbox Live, you have a number next to your SN or where your details are (Post Count, etc), it ranges from 1 to 100. You start at 50. Or you can have 5 stars and start with 3.
As you have more and more substantive conversations with people, they go to your profile and vote YES for you.
Or, if you are someone that just fights online, or is disrespectful constantly, and so on, you can get a NO vote.
After time, you Meter, or Number, or Stars or whatever, will increase or decrease depending on your how others voted for you.
You can limit the Vote to One Vote per Poster a day, or One Vote a day, this way you can't get others to gang up on you. But, really, I think that that would happen only to the "Stars" of the hype. As there are a great number more of the average poster that just sticks to the Bat Forums or what have you.
On Xbox Live, people Anonymously vote for others they play with. If you constantly curse, or are just a rude person or whatever, you can get a Negative Vote, this ultimately reduces your points. When overs decide they want to play, and find that you have low "Rep" points, they know they are not going to have a good time playing with you, therefore can skip to the next play session.
On the Hype, you could have some fore warning to the type of Poster your having a Conversation with. If they, the majority of the time, have great conversations with others, they will generally have higher "Rep Points", and if they have lower "Rep Points" you know that you have a chance that your are dealing with someone that is rude or whatever.
If people see a number next to their name, they tend to want it higher. Just like Post Counts, posters like to have higher numbers. So, they would have to earn it by offering good conversation.
Now, ofcourse you are going to have some posters that just dont care about the system, maybe they will wear a low Rep as a badge. But, when others don't want to conversate with them, they will eventually change their mind.
Rep points doesn't affect your abilities to post, but it could help Self Moderation.
Now, I know others are going to say that people could abuse it, but there has to be a way to fix that. I mean, if Microsoft is using it with Millions of Users, then we could adapt it.