Table 2 Demonstration of the taxonomy on Facebook, Google+, Twitter, LinkedIn, and Instagram

Login data

Email, phone, password

Email, password

Email, username, password

Email, password

Username, password

Connection data

Device, log, and location information, cookies

Device, log, and location information, cookies

Device, log, and location information, cookies

Device, log, and location information, cookies

Device, log, and location information, cookies

Application data

Usage statistics, credit card data

Usage statistics, credit card data

Usage statistics

Usage statistics

Usage statistics

Mandatory data

Name, email, birthday, gender

Name, email, birthday, gender

Name, email

Name, email, job status, country, postal code

Name, email

Extended profile data

General-purpose input fields

General-purpose input fields

Bio, location, website

Professionally related input fields

Phone, gender, bio, website

Ratings/interests

Page, status/photo/video

Page, status/photo/video

Verified account, Tweet

Organization, status

Photo/video

Network data

Unidirectional, bidirectional

Unidirectional

Unidirectional

Bidirectional

Unidirectional

Contextual data

Tag in status/comment, on photo, at location

Tag in status/comment, on photo, at location

Mention in Tweet

Tag in status/comment

Tag on photo

Private commun. data

Private message, video chat, poke

Private message, video chat

Private message

Private message, InMail

N/A

Disclosed data

Text post, photo (album), video, check-in

Text post, photo (album), video, check-in

Text post, single photo

Text post, single photo, file attachments

Single photo, video

Entrusted data

See disclosed data

Restricted to comments

N/A

Restricted to comments

Restricted to comments

Incidental data

See disclosed data

Restricted to comments

N/A

Restricted to comments

Restricted to comments

Disseminated data

See disclosed data

See disclosed data

See disclosed data

See disclosed data

See disclosed data