function sendERC20Tweet(uint256 _amount, string _symbol, string _influencerTwitterHandle) external {
        
        ERC20Basic erc20 = ERC20Basic(tokens[_symbol]);
        require(erc20.transferFrom(msg.sender, address(this), _amount));

        sendEthTweet(_amount, true, _symbol, false, _influencerTwitterHandle, 0);
    }