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diff --git a/doc/images/online_duration/date.png b/doc/images/online_duration/date.png
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diff --git a/doc/images/online_duration/hour.png b/doc/images/online_duration/hour.png
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diff --git a/doc/images/online_duration/user.png b/doc/images/online_duration/user.png
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diff --git a/doc/images/online_duration/weekday.png b/doc/images/online_duration/weekday.png
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diff --git a/doc/mutual_friends.md b/doc/mutual_friends.md
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+mutual_friends.py
+=================
+
+Learn who your ex and her new boyfriend are both friends with.
+
+Usage
+-----
+
+Run from the top-level directory using `python -m`.
+For example:
+
+    > python -m bin.mutual_friends -h
+    usage: mutual_friends.py [-h] [--output-format {csv,json}] UID [UID ...]
+    ...
+
+For example (using made up user IDs/"screen names"),
+
+    > python -m bin.mutual_friends john.doe jane.doe
+    89497105,John,Smith,john.smith
+    3698577,Jane,Smith,jane.smith
+
+In the example above, both "John Doe" and "Jane Doe" are friends with "John
+Smith" and "Jane Smith", whose user IDs are 89497105 and 3698577 respectively.
+Their "screen names" (the part after "vk.com/" of their personal page URLs) are
+"john.smith" and "jane.smith".
+
+The output format is CSV (comma-separated values) by default.
+You can also get a JSON document:
+
+    > python -m bin.mutual_friends --output-format json john.doe jane.doe
+    [
+       {
+          "uid": 89497105,
+          "first_name": "John",
+          "last_name": "Smith",
+          "screen_name": "john.smith"
+       },
+       {
+          "uid": 3698577,
+          "first_name": "Jane",
+          "last_name": "Smith",
+          "screen_name": "jane.smith"
+       }
+    ]
+
+See also
+--------
+
+* [License]
+
+[License]: ../README.md#license
diff --git a/doc/online_duration.md b/doc/online_duration.md
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+online_duration.py
+==================
+
+View/visualize the amount of time people spend online.
+
+Usage
+-----
+
+Run from the top-level directory using `python -m`.
+For example:
+
+    > python -m bin.online_duration -h
+    usage: online_duration.py [-h] [--grouping {user,date,weekday,hour}]
+                              [--input-format {csv,log,null}]
+                              [--output-format {csv,json,img}] [--from DATE_FROM]
+                              [--to DATE_TO]
+                              input [output]
+
+This script additionally requires [matplotlib] to be installed.
+
+Analyze the database produced by [track_status.py] and calculate the total
+amount of time people spent online.
+
+For example (assuming the database in "db.csv" was generated by
+[track_status.py] before):
+
+    > python -m bin.online_duration db.csv
+    89497105,John,Smith,john.smith,0:12:31
+    3698577,Jane,Smith,jane.smith,1:34:46
+
+In the example above, "John Smith" and "Jane Smith" spent approx. 13 and 95
+minutes online respectively.
+
+The output format is CSV (comma-separated values) by default.
+You can also get a JSON document:
+
+    > python -m bin.online_duration --output-format json db.csv
+    [
+       {
+          "uid": 89497105,
+          "first_name": "John",
+          "last_name": "Smith",
+          "screen_name": "john.smith",
+          "duration": "0:12:31"
+       },
+       {
+          "uid": 3698577,
+          "first_name": "Jane",
+          "last_name": "Smith",
+          "screen_name": "jane.smith",
+          "duration": "1:34:46"
+       }
+    ]
+
+The durations are calculated on a per-user basis by default.
+You can change that by supplying either `date` (to group by dates), `weekday`
+(to group by weekdays) or `hour` (to group by day hours) as the `--grouping`
+parameter value.
+For example (assuming that both Jane and Joe spent their time online on Friday,
+June 17, 2016).
+
+```
+> python -m bin.online_duration --output-format json --grouping date db.csv
+[
+   {
+      "date": "2016-06-17",
+      "duration": "1:47:17"
+   }
+]
+```
+
+```
+> python -m bin.online_duration --output-format csv --grouping weekday db.csv
+Monday,0:00:00
+Tuesday,0:00:00
+Wednesday,0:00:00
+Thursday,0:00:00
+Friday,1:47:17
+Saturday,0:00:00
+Sunday,0:00:00
+```
+
+```
+> python -m bin.online_duration --grouping hour db.csv
+0:00:00,0:00:00
+1:00:00,0:00:00
+2:00:00,0:00:00
+3:00:00,0:00:00
+4:00:00,0:03:56
+5:00:00,0:14:14
+6:00:00,0:29:30
+7:00:00,0:31:20
+8:00:00,0:12:04
+9:00:00,0:00:00
+10:00:00,0:00:00
+11:00:00,0:23:14
+12:00:00,0:06:00
+13:00:00,0:46:19
+14:00:00,0:00:00
+15:00:00,0:00:00
+16:00:00,0:00:00
+17:00:00,0:00:00
+18:00:00,0:00:00
+19:00:00,0:00:00
+20:00:00,0:00:00
+21:00:00,0:00:00
+22:00:00,0:00:00
+23:00:00,0:00:00
+```
+
+In my opinion, the script's most useful feature is the ability to easily create
+plots that represent the text data (like in the examples above).
+To produce a plot, pass `img` as the `--output-format` parameter value and add
+a file path to write the image to.
+
+    > python -m bin.online_duration --output-format img db.csv user.png
+
+![user.png]
+
+    > python -m bin.online_duration --output-format img --grouping date db.csv date.png
+
+![date.png]
+
+    > python -m bin.online_duration --output-format img --grouping weekday db.csv weekday.png
+
+![weekday.png]
+
+    > python -m bin.online_duration --output-format img --grouping hour db.csv hour.png
+
+![hour.png]
+
+You can limit the scope of the database by supplying a time range.
+Only online durations that are within the supplied range shall then be
+processed.
+Set the range by specifying both or one of the `--from` and `--to` parameters.
+Values must be in the `%Y-%m-%dT%H:%M:%SZ` format (a subset of ISO 8601).
+
+All dates and times are in UTC.
+
+[matplotlib]: http://matplotlib.org/
+[track_status.py]: track_status.md
+
+[user.png]: images/user.png
+[date.png]: images/date.png
+[weekday.png]: images/weekday.png
+[hour.png]: images/hour.png
+
+Known issues
+------------
+
+* When people go online using the web version and don't visit other pages over
+time (for example, just listening to music), they appear offline.
+Hence the 0:00:00 durations you might sometimes encounter.
+This might also happen using other clients.
+
+See also
+--------
+
+* [License]
+
+[License]: ../README.md#license
diff --git a/doc/track_status.md b/doc/track_status.md
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+++ b/doc/track_status.md
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+track_status.py
+===============
+
+Track when people go online/offline.
+
+Usage
+-----
+
+Run from the top-level directory using `python -m`.
+For example:
+
+    > python -m bin.track_status -h
+    usage: track_status.py [-h] [-t TIMEOUT] [-l LOG]
+                           [--output-format {csv,log,null}] [-o OUTPUT]
+                           UID [UID ...]
+    ...
+
+For example (using made up user IDs/"screen names"),
+
+    > track_status.py john.doe jane.smith
+    [2016-06-18 01:43:34] John Doe is ONLINE.
+    [2016-06-18 01:43:34] John Doe was last seen at 2016-06-18 01:33:58+03:00 using the official iPhone app.
+    [2016-06-18 01:43:34] Jane Smith is OFFLINE.
+    [2016-06-18 01:43:34] Jane Smith was last seen at 2016-06-18 01:15:47+03:00 using the web version (or an unrecognized app).
+    [2016-06-18 01:59:09] Jane Smith went ONLINE.
+    [2016-06-18 01:59:09] Jane Smith was last seen at 2016-06-18 01:59:07+03:00 using the official Android app.
+    [2016-06-18 02:10:00] John Doe went OFFLINE.
+    [2016-06-18 02:10:00] John Doe was last seen at 2016-06-18 01:54:58+03:00 using the official iPhone app.
+    ...
+
+By default, the script produces a human-readable log.
+Use the `--log` parameter to write the log to a file.
+If you want to record when people go online/offline for [further analysis],
+specify the path to a database using the `--output` parameter.
+Be careful: if the file already exists, it will be overwritten!
+
+See also
+--------
+
+* [License]
+
+[License]: ../README.md#license