A friend recently gave me a phone number of someone they didn't know (who wasn't being very nice) - asking me to try and find out who it was.
Here's an #OSINT technique to find a twitter account using a phone number or an email address👇
PS: Have used my number for the example.
The 'Forgot Password' functionality in most applications is underrated AF when gathering intelligence.
Most applications tell you if an account exists, and if it does, they give you a truncated e-mail/number associated with the account.