Here is a list of the subs that have gone silent.
The list
Some are NSFW (yes, this is that big) and I have no idea what some are. I'm only adding subreddits with 5K+ subs to this list, sorry /r/sexypizza[6] .
/r/4chan[7] (655,245 subscribers)
/r/animalsbeingjerks[8] (235,630)
/r/art[9] (3,256,241)
/r/askmen[10] (196,996)
/r/askreddit[11] (8,917,673)
/r/autos[12] (68,814)
/r/badphilosophy[13] (10,955)
/r/banana[14] (6,192)
/r/bestofstreamingvideo[15] (34,226)
/r/blackpeoplgifs[16] (87,663)
/r/blackpeopletwitter[17] (401,375)
/r/bookclub[18] (19,529)
/r/books[19] (5,103,352)
/r/burgers[20] (8,303)
/r/buttcoin[21] (5,894)
/r/buyitforlife[22] (170,159)
/r/candidfashionpolice[23] (54,309)
/r/cannabis[24] (28,112)
/r/centuryclub[25] (???)
/r/cinemagraphs[26] (105,915)
/r/circlejerk[27] (254,505)
/r/crappydesign[28] (189,355)
/r/crossfit[29] (33,678)
/r/dailydouble[30] (12,215)
/r/de_iama[31] (66,824)
/r/destiny[32] (9,764)
/r/dinosaurdrawings[33] (7,404)
/r/documentaries[34] (3,377,766)
/r/doesanybodyelse[35] (252,164)
/r/eatcheapandhealthy[36] (246,228)
/r/facebookcleavage[37] (22,221)
/r/facepalm[38] (375,433)
/r/fallout[39] (221,890)
/r/falloutlore[40] (11,572)
/r/falloutmods[41] (6,078)
/r/fatlogic[42] (92,483)
/r/fiftyfifty[43] (265,464)
/r/finalfantasy[44] (46,065)
/r/finance[45] (62,999)
/r/fnv[46] (18,529)
/r/fo3[47] (6,667)
/r/fo4[48] (16,897)
/r/foshelter[49] (9,400)
/f/fuckolly (9,150)
/r/gadgets[50] (3,427,275)
/r/gaming[51] (8,022,320)
/r/gaming4gamers[52] (29,239)
/r/gore[53] (49,886)
/r/graphicnovels[54] (8,812)
/r/gravityfalls[55] (22,501)
/r/greysanatomy[56] (7,243)
/r/hardcoreaww[57] (37,520)
/r/hiphopheads[58] (294,066)
/r/historicalrage[59] (5,970)
/r/historicalwhatif[60] (54,129)
/r/history[61] (3,431,562)
/r/iama[62] , the original (8,521,238)
/r/imgoingtohellforthis[63] (459,391)
/r/insightfulquestions[64] (38,413)
/r/interstellar[65] (11,100)
/r/intrusivethoughts[66] (22,116)
/r/jobfair[67] (18,920)
/r/karmaconspiracy[68] (58,592)
/r/latvianjokes[69] (29,022)
/r/law[70] (40,776)
/r/lazycats[71] (5,601)
/r/lewronggeneration[72] (52,233)
/r/lifeprotips[73] (4,112,364)
/r/listentothis[74] has locked submissions[75] (3,354,651)
/r/litecoin[76] (25,611)
/r/lookatmydog[77] (19,927)
/r/louisiana[78] (5,400)
/r/massivecock[79] (31,461)
/r/mineralporn[80] (20,594)
/r/morbidreality[81] (187,712)
/r/movies[82] (7,662,117)
/r/music[83] (7,391,288)
/r/netsec[84] (134,403)
/r/nsfwgif[85] (9,792)
/r/obscuremedia[86] (38,692)
/r/onoff[87] (168,990)
/r/paomustresign[88] (7,535)
/r/photography[89] (243,189)
/r/pics[90] has locked submissions (8,823,504)
/r/preggo[91] (5,596)
/r/rbi[92] (28,584)
/r/regularshow[93] (21,943)
/r/samsung[94] (6,634)
/r/science[95] (8,595,726)
/r/seo[96] (24,671)
/r/shittyreactiongifs[97] (111,647)
/r/spain[98] (5,829)
/r/splitdepthgifs[99] (41,023)
/r/splatoon[100] (18,031)
/r/srssucks[101] (12,505)
/r/starcitizen[102] (51,971)
/r/subredditcancer[103] (7,979)
/r/subredditdramadrama[104] (6,185)
/r/ted[105] (33,288)
/r/teenagers[106] (98,555)
/r/thelastairbender[107] (138,974)
/r/theonion[108] (10,749)
/r/thepopcornstand[109] (7,087)
/r/timanderic[110] given to /pol/ (20,852)
/r/tinder[111] (137,103)
/r/todayilearned[112] (8,782,268)
/r/torrents[113]
/r/trackers[114] (47,245)
/r/twitter[115] (8,402)
/r/ukpolitics[116] (36,450)
/r/unexpectedthuglife[117] (199,623)
/r/universityofreddit[118] (74,204)
/r/usenet[119] (21,516)
/r/videos[120] (8,082,138)
/r/wastedgifs[121] (108,569)
/r/wildernessbackpacking[122] (8,816)
/r/worldbuilding[123] (54,407)
/r/worstof[124] (35,435)
/r/wouldyoufuckmywife[125] (29,169)
/r/youdontsurf[126] (176,671)