What would this accomplish, other than perhaps not giving their email to 8x8?
If they have taken the 8x8 test to know their answers, they may as well enter an email address to be alerted when they have a match. Rather than checking Twitter, seeing as 8x8 already plans to email you if you have a match.
In theory if two Twitter users took the test and were a match - there would be no need to use a hashtag to tweet.
This could be useful if enough people participated and were interested in finding an "8x7" or even "8x6" match by changing their answer of two questions. But even then, you would need enough participants who use Twitter and are willing to tweet their answers.
If they have taken the 8x8 test to know their answers, they may as well enter an email address to be alerted when they have a match. Rather than checking Twitter, seeing as 8x8 already plans to email you if you have a match.
In theory if two Twitter users took the test and were a match - there would be no need to use a hashtag to tweet.
This could be useful if enough people participated and were interested in finding an "8x7" or even "8x6" match by changing their answer of two questions. But even then, you would need enough participants who use Twitter and are willing to tweet their answers.