That opener works only on certain girls. Other girls will ignore and it will not catch there attention. I've written a guide to how to do successful online openers on my site you can check out if u want. There's no rule to how much messages you send a person, if you do it right and get her attention and interest you can do 10 messages a day because she'll reply fast. Just make sure to lead the conversation to create a connection and a number closing point. Feel free to PM me if you have questions, good luck.
_________________
Learn how I picked up hundreds of girls online without leaving home! Click on the link for your free guide, 7 Secrets to Online Attraction!
http://attractionkings.com