They can be manipulated too easily.
A real transaction ID would be better.
Personaly I can not recommend to participate in a faucet that has a minimum payout!
It happend too many times in the past that they did not pay in the end!
Thanks for this message if you want that I can give you that transaction ID.
http://buxlister.com/blog/check-bitcoin/?the99btcbfaddress=3JKbvSMqhzAASohV914yzqvmqANmUtmez7
http://buxlister.com/blog/check-bitcoin/?the99btcbfaddress=1H7QHMpmkMtLqqkrF5NT8mznEQrqizj3ww
http://buxlister.com/blog/check-bitcoin/?the99btcbfaddress=1KjwadrqLLvNkGhy5pRsNY5TJoHMtrBFS1
http://buxlister.com/blog/check-bitcoin/?the99btcbfaddress=1MRLrdV7ztysQtVPWoj5MqR8t8BqYF5sDd
http://buxlister.com/blog/check-bitcoin/?the99btcbfaddress=185kMAqK7KZL12QRggsV8dwdEA2Jo9h6PD
and many more..