How Servers Automatically Connect Users Based on Mutual Friend Lists
A method for servers to automatically create secure communication links between two users only if they have both added each other to their respective contact or buddy lists.
Original patent title: “USRE45254E1 - Implicit population of access control lists”
A method for servers to automatically create secure communication links between two users only if they have both added each other to their respective contact or buddy lists. Granted to Facebook Inc in 2014 with 36 claims and 7 forward citations.
Key facts
Coverage
What does this patent actually cover?
The patent describes a server-side process that checks if two users have mutually added each other to their contact lists. When both users have the other person on their list, the server interprets this as an implicit trust relationship. Based on this mutual confirmation, the server automatically enables a direct communication pathway, such as a peer-to-peer connection or a virtual private network (VPN), between their devices. This removes the need for manual approval or complex configuration every time two known contacts want to communicate securely.
The gap
What does this patent NOT cover?
- Does not cover connections where only one user has added the other to their list.
- Does not cover manual connection requests that require explicit user-to-user permission prompts.
- Does not cover systems that rely on third-party identity verification rather than user-maintained lists.
- Does not cover local device-to-device discovery that occurs without server-side verification of contact lists.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
It treats the existence of a mutual entry in two separate, private user lists as a cryptographic-like proxy for trust, allowing the network to self-configure connectivity.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Instant messaging buddy lists
Social media direct messaging systems
Peer-to-peer file sharing applications
Encrypted chat platforms
Why it matters
The bigger picture
This patent addresses the friction of establishing secure, direct communication in early social networking and instant messaging platforms. By automating the 'trust' handshake, it allowed services to scale peer-to-peer features without overwhelming users with security prompts. It represents a shift toward using social graph data to manage network-level connectivity.
Filed
May 31, 2013
Granted
November 18, 2014
Market context
Who's building on this
Companies in this space
Facebook (Meta) remains the primary entity associated with this logic, as it aligns with their core social graph infrastructure. Other major messaging platforms like WhatsApp and Telegram utilize similar logic to manage peer-to-peer signaling and trust-based communication pathways.
Market impact
This patent helped define the backend architecture for social-aware networking. It enabled platforms to offer seamless, secure communication features that felt 'automatic' to users, effectively setting a standard for how social connectivity features are integrated into messaging applications.
Claim 1 — Plain English
What this patent covers
The patent describes a server-side process that checks if two users have mutually added each other to their contact lists. When both users have the other person on their list, the server interprets this as an implicit trust relationship. Based on this mutual confirmation, the server automatically enables a direct communication pathway, such as a peer-to-peer connection or a virtual private network (VPN), between their devices. This removes the need for manual approval or complex configuration every time two known contacts want to communicate securely.
The clever bit
It treats the existence of a mutual entry in two separate, private user lists as a cryptographic-like proxy for trust, allowing the network to self-configure connectivity.
What it does not cover
- Does not cover connections where only one user has added the other to their list.
- Does not cover manual connection requests that require explicit user-to-user permission prompts.
- Does not cover systems that rely on third-party identity verification rather than user-maintained lists.
- Does not cover local device-to-device discovery that occurs without server-side verification of contact lists.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
PatentBrief Score
Impact Score
Strong
Citation count
18/40
Early citations
Claim breadth
20/20
Very broad protection
Recency
5/20
Granted 10–20 years ago
Assignee scale
20/20
Major company or institution
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$94K – $301K
Midpoint $188K · 7.0 yr remaining · industry ×1.4
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
The original legal language
Original claims
36 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Roskind, J. A. (2014). How Servers Automatically Connect Users Based on Mutual Friend Lists (U.S. Patent No. RE45,254). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/RE45254/google-docs
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How Servers Automatically Connect Users Based on Mutual Friend Lists cover?
A method for servers to automatically create secure communication links between two users only if they have both added each other to their respective contact or buddy lists.
Who owns patent US RE45254?
Facebook Inc owns this patent, granted in 2014.
When does this patent expire?
This patent is expected to expire on November 18, 2034, when the invention enters the public domain.
What is patent US RE45254 cited by?
This patent has been cited by 7 later patents that build on its ideas.
What problem does this patent solve?
This patent addresses the friction of establishing secure, direct communication in early social networking and instant messaging platforms. By automating the 'trust' handshake, it allowed services to scale peer-to-peer features without overwhelming users with security prompts. It represents a shift toward using social graph data to manage network-level connectivity.
What does this patent NOT cover?
Does not cover connections where only one user has added the other to their list.
Same assignee
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