Don't require a one liner. I hate one liners. Make it optional.
The logo and logotype are ok, but everything else looks like a default template. Why not take the design seriously and actually develop a theme? It looks like the microsoft guys hired out for the logo and did the site in house. no offense. Well, just a little.
Why are you getting into this crowded marketplace? What is new about this?
After logging in you say something like, "We're a dating site, but were also kind of like facebook, and if you get a hook up here you're totally lucky, cuz we're way too chill to stress it, bro". I lost faith immediately.
Also, Advanced search has major problems:
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Notice: Undefined variable: latitude in /var/www/dating/trunk/html/search-advanced.php on line 700
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