https://twitter.com/Tibiceninae/status/405472230450016256

je@seth:~$ echo 19-05-01-18-03-08 18-05-04-04-09-20 | perl -pne 's{0?(\d+)}{chr(64+int($1))}sgex;s/-//g'
SEARCH REDDIT

#!/usr/bin/python
import Image
import sys

im = Image.open("/home/je/Projects/Cicada/BaCG2F9CYAEsmRZ.jpg", "r")
w, h = im.size

for y in range(h):
    for x in range(w):
        r, g, b = im.getpixel((x, y))
        assert (r == g and g == b)
        if r == 255:
            sys.stdout.write(" ")
        elif r == 254:
            sys.stdout.write("X")
        elif r == 253:
            sys.stdout.write(".")
        elif r == 252:
            sys.stdout.write("o")
        elif r == 251:
            sys.stdout.write("x")
        else:
            sys.stdout.write("-")
    sys.stdout.write("\n")

sys.exit(0)

71*8 pixels wide hidden block, and 71 is prime. The height = 7*8 pixels, with "row" 2-6 being equal.
15*8 pixels wide hidden block to the right of the visible text.
the upper row looks like it could contain the letters A, H, M and L.
resembles a barcode, but i think the resemblance is superficial, due to row 2-6 being repeated.
254/254/254 -> "X", 253/253/253 -> ".", binary 0/1?
252/252/252 and 251/251/251 parts of the encoded data, or artifacts due to jpeg compression?

// Joel Eriksson <je at clevcode.org>