Dating sites for twitterers

I did a search for dating sites catering to the Twitter niche and found just three:

I did a google search and found these sites:

Site	Alexa.com rank
http://plentyoftweeps.com	1121827
http://flirt140.com	2100858
http://www.datetwit.com	3116521

Based on the poor Alexa rankings there is not much fire in these sites just yet. Advertising might still be ramped up, but in the mean time compare for example, my purely academic tree genus site which has an Alexa ranking of 1605781, and it is not advertised anywhere.
Any reasonably active site should have a rank lower than 100,000.
I guess love just doesn't fit into 140 characters!