The other solution is using OP_return. OP_return is a script which indicates a transaction as invalid. One can include messages in hex data for up to 80bytes. You can use coinb.in to try this feature. Go to https://coinb.in/#newTransaction and select advanced option. Remember to include another output that has hex messages as the address.
I saw some address on blockchain.info that show the owner name... for example for the address of bitcointalkforum and some moderators...
How to do this? Thanks!
[1] https://blockchain.info/wallet/#/
[2] https://blockchain.info/address/192fqgb5aCKrjNkudGqSWR6Nuu4J8tEMB7
[3] https://blockchain.info/tags