Even if your registered username isn’t immediately visible in a dating profile, it’s often visible in the URL of your profile, your profile photo filenames, or during communication with other users.
There are plenty of free and paid services which search and monitor social media and email accounts by username. It will rapidly scan popular sites and services for email addresses, usernames, names, and phone numbers to build a comprehensive profile of a person.
Were your photos taken in an apartment building or dorm that can be easily identified in other people’s photos?
Somebody with malicious intent may use this to their advantage when trying to correlate your dating profile to other web content.
He or she will very likely check search engine caches for old pictures or bios that are easier to identify or contain embarrassing details.
If that professional headshot is still in a cache associated with your dating profile, he or she can use Tineye to match it to your corporate bio that shares the same photograph.
If you’ve changed your username, he or she may be able to find the previous version.