Yes flairdrop.net is designed so it will do exactly that. If you have an existing ERC20 address to import addresses from, that's exactly what it can do now. If you're interested I can also fix the csv import function so you can import from a CSV file if you prefer. What is steemit chat?
Almost forgot, make sure you're logged into metamask when you use it, it connects to the Ethereum network using your metamask or mist web3 provider.
Wow, let us chat...mine is charles1 ..we can do nice things together