To search for their profile picture, savetheir social media profile pictures (and any other likely candidates for dating profile pictures) and drag them one by one into the google images search bar.
i caught my bf on a dating site
In that case, one option is to create your own account on one of these sites and then search for your husband or wifes physical attributes and location to see if you find a matching profile.
i caught my boyfriend on a dating site
You'll need to check their phone for common dating apps, conduct a google search using personal details like their email address, and, if necesary, create test accounts on popular apps and sites to see if your signifigant other is returned as a potential match.
(note: flexispy and others have been caught in a scandal involving hacked user accounts and potentially illegal orunethical surveillance.
Fall season, which, in my opinion is the best for dating, was filled with walks in leaf-strewn parks, pumpkin cinnamon lattes, and football games.
Fortunately, these sites aren't as safe and anonymous as would be adulterers and cheaters would like to believe.
If all else fails, you can engage professional investigators to find out for certain whether your signifigant other is using a dating site.