Metadata by services from A Guardian guide to your metadata.
sender's name, email and IP address
recipient's name and email address
server transfer information
date, time and timezone
unique identifier of email and related emails
content type and encoding
mail client login records with IP address
mail client header formats
priority and categories
subject of email
status of the email
read receipt request
##phone
phone number of every caller
unique serial numbers of phones involved
time of call
duration of call
location of each participant
telephone calling card numbers
##camera
photographer identification
creation and modification date and time
location where photo was taken
details about a photo's contents
copyright information
camera make and model
camera settings: shutter speed, f-stop, focal length and flash type
photo dimensions, resolution and orientation
your name and profile bio information including birthday, hometown, work history and interests
your username and unique identifier
your subscriptions
your location
your device
activity date, time and timezone
your activities, likes, checkins and events
your name, location, language, profile bio information and url
when you created your account
your username and unique identifier
tweet's location, date, time and timezone
tweet's unique ID and ID of tweet replied to
contributor IDs
your follower, following and favorite count
your verification status
application sending the tweet
##google search
your search queries
results that appeared in searches
pages you visit from search
##web browser
your activity including pages you visit and when
user data and possibly user login details with auto-fill features
your IP address, internet service provider, device hardware details, operating system and browser version
cookies and cached data from websites