<...>It is impossible to find out the number of genuine accounts - too many bots are registered. Perhaps genuine is 1 in 50 and perhaps 1 in 1000...
This could give us a clue: I’ve used @Piggy’s full dataset (covers full months up to October 2018) to count the number of registered accounts with 0 posts. Now there could be a number of reasons for registering and having no posts (don’t want to, nuked (*), etc.), but I’d say, more likely than not, many cases are botty created accounts.
On overall average, 73,18% of all created accounts have 0 associated posts.
Year Month nAccounts 0Posts %0Posts
2018 10 39353 31859 80,96%
2018 9 45362 35917 79,18%
2018 8 54384 42815 78,73%
2018 7 69840 53517 76,63%
2018 6 77681 57388 73,88%
2018 5 91993 66755 72,57%
2018 4 86898 63823 73,45%
2018 3 97644 69923 71,61%
2018 2 112211 82573 73,59%
2018 1 214546 171502 79,94%
2017 12 191455 155404 81,17%
2017 11 97286 68276 70,18%
2017 10 89443 59339 66,34%
2017 9 46186 26730 57,87%
2017 8 42254 25514 60,38%
2017 7 41011 27543 67,16%
2017 6 32733 20032 61,20%
2017 5 23978 15127 63,09%
2017 4 15807 9820 62,12%
2017 3 14760 9495 64,33%
2017 2 12677 8227 64,90%
2017 1 13354 9003 67,42%
2016 12 11199 7484 66,83%
2016 11 11187 7254 64,84%
2016 10 9935 6780 68,24%
2016 9 9923 6595 66,46%
2016 8 11193 6832 61,04%
2016 7 11257 7794 69,24%
2016 6 20630 16177 78,41%
2016 5 16918 13434 79,41%
2016 4 18493 14798 80,02%
2016 3 24945 21438 85,94%
2016 2 40436 36777 90,95%
2016 1 39178 35480 90,56%
2015 12 39950 36841 92,22%
2015 11 44059 40887 92,80%
2015 10 68831 65930 95,79%
2015 9 7727 5046 65,30%
2015 8 10942 8105 74,07%
2015 7 12616 9489 75,21%
2015 6 9310 6630 71,21%
2015 5 8037 5571 69,32%
2015 4 8914 6094 68,36%
2015 3 38297 34399 89,82%
2015 2 34357 30799 89,64%
2015 1 20794 17206 82,75%
2014 12 8391 5061 60,31%
2014 11 7996 4490 56,15%
2014 10 8332 4606 55,28%
2014 9 10158 5825 57,34%
2014 8 11443 6699 58,54%
2014 7 11119 6434 57,86%
2014 6 11952 7129 59,65%
2014 5 14264 7685 53,88%
2014 4 17948 11318 63,06%
2014 3 33521 24153 72,05%
2014 2 25450 13680 53,75%
2014 1 26619 12079 45,38%
2013 12 31775 15383 48,41%
2013 11 19680 10776 54,76%
2013 10 2927 1562 53,37%
2013 9 5155 2738 53,11%
2013 8 6052 3410 56,35%
2013 7 7413 3764 50,78%
2013 6 9372 5197 55,45%
2013 5 15512 8771 56,54%
2013 4 18712 8986 48,02%
2013 3 7357 3453 46,93%
2013 2 3532 1794 50,79%
2013 1 3184 1859 58,39%
2012 12 2765 1691 61,16%
2012 11 2708 1763 65,10%
2012 10 3199 2067 64,61%
2012 9 2345 1268 54,07%
2012 8 2394 1230 51,38%
2012 7 2109 1197 56,76%
2012 6 2079 1318 63,40%
2012 5 2017 1265 62,72%
2012 4 2071 1417 68,42%
2012 3 2117 1518 71,71%
2012 2 1991 1275 64,04%
2012 1 2051 1287 62,75%
2011 12 1719 1304 75,86%
2011 11 1990 1545 77,64%
2011 10 2060 1469 71,31%
2011 9 2443 1706 69,83%
2011 8 3856 2511 65,12%
2011 7 5451 3278 60,14%
2011 6 14434 7318 50,70%
2011 5 5866 2947 50,24%
2011 4 2822 1864 66,05%
2011 3 2423 1760 72,64%
2011 2 1090 564 51,74%
2011 1 376 179 47,61%
2010 12 422 161 38,15%
2010 11 218 115 52,75%
2010 10 174 76 43,68%
2010 9 167 92 55,09%
2010 8 163 82 50,31%
2010 7 333 58 17,42%
2010 6 34 8 23,53%
2010 5 15 2 13,33%
2010 4 22 1 04,55%
2010 3 5 0 00,00%
2010 2 22 0 00,00%
2010 1 8 0 00,00%
2009 12 8 0 00,00%
2009 11 3 0 00,00%
(*) According to @suchmoon’s post on banned accouts (see [MERIT][NSFN] We're destroying more merits than we're sending. Like, way more), between 1,2k and 1,7k accounts are nuked every month, thus causing these accounts to have 0 posts.