One more uncharacteristically earnest tip: And as we've said before, you simply cannot take it personally if you don't get a response. If your match mentions loving a specific film, use a quote from it as your subject.
And on the subject of timing, the first email is not the time to ask someone out on a date. Did they write something so funny it made you spit out your tea? If you want your first message to a girl to have a bit more kick to it, you can always offer her a challenge. A shortish message is intriguing but don't write too little — otherwise, you'll look lazy. Now this starts before you even begin online dating. And if you send a message, should you be serious, or try to be funny, or flirtatious?