There are couple for solutions

1. [Tweet][1]
2. http://rinkeby-faucet.com/
3. Post URL in Google+
4. Post URL in facebook


  [1]: https://twitter.com/intent/tweet?text=Requesting%20faucet%20funds%20into%200x0000000000000000000000000000000000000000%20on%20the%20%23Rinkeby%20%23Ethereum%20test%20network