Ok, first of all, I'm so glad that we're all talking about this. For internet savvy Christian singles such as ourselves. This is a huge issue. I'm not saying it's "huge" as in good or bad. I mean "huge" as in relavent.
I posted somewhere, I don't remember where, on Joshua Harris' website he got a wise pastor to write his opinion on internet dating. He's lists pros and cons and has advice for those who want to do it.
He wrote this, which I think is really wise:
"The biggest concern we have about online dating is that it seems to go under the radar. People aren't talking to their friends or their care groups or their pastors about the people they are meeting online. We realize that you might be wary of sharing this with others because of a perceived "stigma" that on-line dating has, but you need to be seeking wisdom from others to help you honor God more than you need to maintain a reputation. It is unwise to not invite your friends who care for you and know you well to help you evaluate the type of people you are meeting online. The reality is that no matter how often you re-read their profiles, talk to them through email or phone, you still do not really know this person. What we would suggest is that you invite family or a trusted friend into your correspondence with the people you are meeting. We know this sounds very personal, but consider letting them read the emails, profiles, etc. to get their perspective on these individuals. We are aware of some examples of humble people who have done just this as they sought to apply biblical principles to online dating. Finally, bring the people you are meeting into your community so your family and friends and pastors can begin to get to know them face-to-face. This will bring much needed grace, protection, and wisdom to you as you evaluate this relationship." [emphasis mine]