Add document to record sites that have been removed from Sherlock. This will ensure that they will not be added again, and will remind us to check back on them in case their design might have changed (so they are compatible with Sherlock again).

removed_sites.md

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+# List Of Sites Removed From Sherlock
+
+This is a list of sites implemented in such a way that the current design of
+Sherlock is not capable of determining if a given username exists or not.
+They are listed here in the hope that things may change in the future
+so they may be re-included.
+
+## Younow
+
+Younow has changed their website (sometime before 2019-03-10) such that you
+cannot see any user's profile unless you log in. So, it is now impossible to
+probe for the existence of a username using the current strategy.
+
+```
+  "Younow": {
+    "errorMsg": "pageTitle || 'YouNow - Broadcast Live",
+    "errorType": "message",
+    "rank": 13248,
+    "url": "https://www.younow.com/{}",
+    "urlMain": "https://www.younow.com/",
+    "username_claimed": "blue",
+    "username_unclaimed": "noonewouldeverusethis7"
+  }
+```
+
+## BlackPlanet
+
+This site has always returned a false positive.  The site returns the exact
+same text for a claimed or an unclaimed username.  The site must be rendering
+all of the different content using Javascript in the browser.  So, there is
+no way distinguish between the results with the current design of Sherlock.
+
+```
+  "BlackPlanet": {
+    "errorMsg": "My Hits",
+    "errorType": "message",
+    "rank": 110021,
+    "url": "http://blackplanet.com/{}",
+    "urlMain": "http://blackplanet.com/"
+  },
+```
+
+## Fotolog
+
+Around 2019-02-09, I get a 502 HTTP error (bad gateway) for any access.  On
+2019-03-10, the site is up, but it is in maintenance mode.
+
+It does not seem to be working, so there is no sense in including it in
+Sherlock.
+
+```
+  "Fotolog": {
+    "errorType": "status_code",
+    "rank": 47777,
+    "url": "https://fotolog.com/{}",
+    "urlMain": "https://fotolog.com/"
+  },
+```