When people were overly positive, exaggerating similarities and the expectation of future interactions, disillusionment was very likely; this effect was greater when communication was lower, presumably because people are able to maintain positive illusions in the absence of information about the other person, leading to a greater risk of being disappointed.
Similarly, greater communication predicted a more successful first date, especially when people really were similar to each other.
It appears that, in general, people who ask more before the first date have a better experience than those who wait until they meet to find out important information, possibly because they are less likely to be disillusioned.
And after hundreds of first dates, who wants to waste their time finding out they didn't need to meet in person anyway?
Yet, 1/3rd of people who have used a dating site have never met up for an in-person date.
Lastly, in spite of the rise in online dating, only 5% of married couples or those in a committed relationship say they met their partners online, and 88% of people say they met their partners via conventional means.
There was no point at which there was too much similarity, at least right after the first date.