Remember, there are clear legal restrictions on what you can and can't do when it comes to accessing or tracking someone's phone.
Make sure you're aware of them before you do anything that might get you into trouble with the law.
The very simplest, a Google search will often turn up social media profiles, forum posts, and blog comments tied to a particular username.
If you’re concerned about dating site matches finding your online presence, or people online finding your dating profile, just don’t reuse usernames or email addresses!
There are two sets of clues that can give away important personal information in your photos. Consider: is there a window in your photos, and are there identifiable buildings or landmarks outside of it?