Dinder - Decentralized Tinder

Dinder.sol

pragma solidity ^0.4.9;

contract Dinder {
    mapping(address => mapping(address => bool)) connections;
    mapping(address => int) thumbUps;
    
    function thumbUp(address a) {
        if (connections[a][msg.sender]) throw;
        connections[a][msg.sender] = true;
        thumbUps[a] += 1;
    }
    
    function getWhisperTopic(address a) constant returns (bytes32) {
        if (connections[a][msg.sender] && connections[msg.sender][a]) {
            uint mix = uint(a) + uint(msg.sender);
            return sha3(mix);
        }
    }
}