Public-source review
Designing workflows that help people move from a candidate result to the original public page and its surrounding context.
Founder profile
Di Tang
Also known as Daniel Tang
Founder and Product Builder
Founder and product builder behind 221B Face Search, focused on public-source review, responsible OSINT, and online-safety workflows.
Responsible OSINT
Keeping search scope, evidence quality, uncertainty, and manual verification visible throughout the research process.
Online safety
Making catfish checks and photo-misuse review easier to understand without presenting a similarity signal as proof of identity.
Publishing responsibility
Clear sources, limits, and corrections.
Di is responsible for the product and editorial direction of 221B Face Search. Guides are expected to distinguish public-source evidence from inference, explain product limits, and provide a clear route for reporting a correction.
Published work
Guides written and reviewed by Di Tang
Each guide names its sources, review date, practical limits, and correction route. Candidate pages and missing results remain inconclusive until the original public context is reviewed.
11 min read
Best PimEyes Alternatives: Free & Paid Options for 2026
Compare free and paid PimEyes alternatives, including Google Lens, Lenso.ai, and 221B, by search type, source access, privacy, pricing, and best fit.
Read the guide →12 min read
How to Reverse Image Search on Android: 5 Safe Ways
Search a saved photo, screenshot or image on a webpage from Android, then review public source pages without treating a visual match as identity proof.
Read the guide →8 min read
How to Find Someone by Photo: 7 Safe Steps (2026)
Learn how to find someone by photo safely using reverse image search, reverse face search, source-page review, and a verification-first workflow.
Read the guide →15 min read
How to Verify a LinkedIn Profile Safely: A Consent-First Guide
A consent-first workflow for checking LinkedIn profile claims through native verification badges, official company channels, public sources, and carefully limited photo searches.
Read the guide →14 min read
PimEyes vs Lenso.ai vs 221B: A Safer 2026 Comparison
A source-led 2026 comparison of PimEyes, Lenso.ai, Google Lens, and 221B by public-web scope, access, privacy statements, source review, and safety limits.
Read the guide →14 min read
How to Tell If a Dating Profile Photo Is AI-Generated (2026)
A careful, evidence-led workflow for checking whether a dating profile photo may be AI-generated without treating one visual clue, search result, or badge as proof.
Read the guide →9 min read
Reverse Face Search vs Image Search for Dating Verification
For dating safety, exact-image search can locate copied photos while public-web face search may surface candidate pages across different photos. Neither verifies identity.
Read the guide →13 min read
Tinder Reverse Image Search: A Safe, Evidence-First Guide (2026)
A Tinder photo can be checked in more than one way, but no search can certify a stranger. Use exact-image search, public-web face search, source review, platform tools, and first-date safety steps without turning one result into a verdict.
Read the guide →11 min read
How to Reverse Image Search on iPhone: Photos, Safari and Lens
Find the web context of a saved photo, screenshot or browser image on iPhone, with current Apple and Google steps and careful source review.
Read the guide →14 min read
Facebook Marketplace Scams: 9 Checks Before You Pay
A calm, evidence-first checklist for reviewing Facebook Marketplace listings, seller profiles, photos, payment requests, and report paths before sending money.
Read the guide →13 min read
Best Face Search Alternatives: 4 Options for 2026
Compare face search alternatives for exact-image checks, open-web monitoring, broader image discovery, and verification-first candidate-page review.
Read the guide →11 min read
How to Check If Someone Is Real Online: 9 Safer Steps
A practical nine-step guide to checking if someone is real online through behavior, exact-image search, candidate public pages, source review, and an optional video call—without treating any clue as identity proof.
Read the guide →15 min read
Military Romance Scams: How to Check Stolen Soldier Photos Safely
A safety-first guide to military romance scam photo checks, official claim verification, evidence preservation, and reporting without accusing the person pictured.
Read the guide →10 min read
Someone Is Using My Photos: Find the Fake Profiles (2026)
Worried someone is using your photos for a fake profile? A 2026 step-by-step guide to finding impersonation accounts with reverse face search, capturing evidence, and reporting them.
Read the guide →9 min read
Face Search vs Reverse Image Search: What's the Difference?
Reverse image search finds copies or visually similar images. Public-web face search may surface candidate pages across different photos. Here is how to use each without claiming identity.
Read the guide →10 min read
Free vs Paid Face Search Tools (2026): What You Actually Get
A practical 2026 guide to free vs paid face search tools: what free methods do well, where paid tools help more, and when 221B is worth the upgrade.
Read the guide →14 min read
How to Detect Catfishing Safely with Face Search (2026)
A safety-first workflow for checking a suspected catfish using behavior, exact-image search, candidate public pages, platform tools, and official reporting channels.
Read the guide →11 min read
How to Find Someone on Instagram by Photo (2026 Guide)
A safe 2026 tutorial for finding an Instagram account by photo using Google Lens, reverse face search, public clues, and source-page review.
Read the guide →11 min read
How to Find Someone on Social Media by Photo (2026 Guide)
A safe, practical 2026 workflow for finding social media accounts by photo with Google Lens, reverse face search, source-page review, and 221B.
Read the guide →15 min read
OSINT Face Search: An Ethical Public-Source Review Guide
A bounded guide to using face search for authorized public-source review, with source verification, uncertainty labels, privacy safeguards, and clear prohibited uses.
Read the guide →