Medium’s Data Logs

Medium
Medium
Oct 3, 2016 · Unlisted

At Medium, we maintain two types of logs: server logs and event logs.

Server logs: Like most internet companies, our servers automatically record each request made when someone visits our sites uses our apps. We have two types of server logs: web proxies and application. These server logs may include your web request, IP address, browser type, browser language, the date and time of your request, and one or more cookies that may uniquely identify your browser. We will delete all server logs after 30 days or earlier.

Here is an anonymized example of a web proxy log entry for a user who views a post:

01.01.01.01 — — [10/Apr/2014:18:04:24 +0000]+0.018 “GET /p/xxxxxxxxxxx HTTP/1.1” 410 2467 “http://www.google.com" “Mozilla/5.0 (Windows; U; Win 9x 4.90; SG; rv:1.9.2.4) Gecko/20101104 Netscape/9.1.0285” “1010101010101:10x10x10x10x” “-” “medium.com

The parts are as follows:

Event logs: Our event logs record user actions on the site, such as clicking through stories or scrolling. Event logs do not contain IP addresses, user names, user addresses, or user email addresses. They do contain user IDs generated by Medium, as well as descriptions of actions users take on the site. We may keep event logs indefinitely.

Here’s an example of an anonymized event log entry for a user who views a post:

{“tags”: {“usergroup”: “1”},”isAuthenticated”: false,”userId”: “lo_10101010101”, “id”: “xx0101010101”,”type”: “emit”,”client”: “web”,”createdAt”: 1397152749513,”reportedAt”: 1397152747909,”name”: “post.xoxoxoxoxo”, “value”: 1,”data”: {“location”: “http://sauna-spa-hammam.com/?help=matter/22979c8ec9d6", “referrer”: “http://tech.slashdot.org/submission/3475293/are-the-deaf-being-silenced?sdsrc=rel","userId": “lo_10101010101”, “collectionSlug”: “matter”, “postId”: “22979c8ec9d6”}}

The parts are as follows:

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