Voting

Each post has two buttons: like and dislike. Both are on-chain transactions and both are multiplied by the voter's weight.

What happens when you vote

When you like someone else's post, the contract:

1. Computes w = weightOf(msg.sender) — your weight, not the author's.
2. Adds w to the post's weightedLikes.
3. Adds w to karmaOf[author].
4. Increments likeCount (the raw count) by 1.
5. Stores w in your vote and emits Liked(id, you, w).

Dislike does the same but subtracts.

Withdrawing a vote returns exactly what was added

Each vote remembers its weight at the time it was cast. When you withdraw a like, the contract subtracts exactly the stored _likeWeight — even if your weight has changed since. This keeps karma consistent: withdrawing a vote cannot create a discrepancy.

Clicking the currently selected button withdraws the vote. You can change your mind between like and dislike: the contract withdraws the old one first, then records the new one.

You can't vote on yourself

Voting on your own post is rejected (CannotVoteSelf). This is why karma can't be self-farmed by liking your own posts.

Two counters, two purposes

Each post keeps two pairs of numbers:

Field	Meaning
likeCount / dislikeCount	Raw headcount — used for display
weightedLikes / weightedDislikes	Weighted totals — used for ranking and karma

The ranking algorithm only reads the weighted version. A ring can inflate likeCount to 99 with 100 wallets, but its weightedLikes stays 0, because each wallet has weight 1.

Don't rank by raw counts

Using likeCount instead of weightedLikes is exactly the bug the weight mechanism exists to block.

Newcomer votes

A new wallet has weight 1, so its vote is worth 0.01 of a full vote. Anyone can vote immediately, but a stranger's vote barely changes the ranking. See Karma and weight.

On chain

function like(uint256 id) external;
function dislike(uint256 id) external;
function unlike(uint256 id) external;
function undislike(uint256 id) external;

A vote's state for an account is read from hasLiked(id, account) and hasDisliked(id, account).