Well I was just forwarded a link, please go visit it before reading the rest of the post I will wait.
Back? good... now the first thing that comes to mind is WHAT THE FRACK!!! What kind of screwed up society would invent such a thing (ok that not exactly true, it has been invented way before since it is only a pixel manipulation thing) and make it widespread. I have a thing again obesity but I have an even bigger thing against stupidity. Just because your making yourself look thinner on picture doesn't mean you actual are! Beside how can someone who took his own picture and slimmed himself (or herself) actually believe he is thinner??
Also as someone who use dating site, I fear this technology will only bring more deceit and lies into the online dating process. Just imagine the lies that will be posted and supported thanks to this. It will be a source of one more false expectation created by the process of online dating (not the first and that probably the main problem of online dating) but come on.
I think that you cannot love someone before you accept (or even love) yourself and those self delusion tools are only promoting vanity and decadence. As well as promoting the opinion that thinness is more beautiful for everyone. Yeah I know it kinda of hypocritical of me to say that since I prefer thin woman but I don't expect everyone to have the same taste I do.. in fact I hope it's not the case.