If you just put a link to your vCard on a webpage, some browsers cannot parse it as a vCard. For instance try downloading this vCard.
To enable browser to corectly read a vCard, just copy and paste this code into your .htaccess file
<Files ~ "\.vcf$">ForceType text/x-vcard</Files>
This should now enable the browser to properly download the vCard. Try downloadable vCard.
