kittey said:
See above. It was retired because no post uploaded within the last two years had tag_me on it. Due to insane peer pressure to properly tag uploads, almost nobody uses tagme and the ones who do spell it tagme, not tag_me. If a post is uploaded with no tags or all tags are removed from an existing post, the site adds tagme automatically.
To clear any remaining doubt, the algorithm for automatically expiring tags doesn’t care how often the target tag of an alias or implication is used, so no posts being tagged tagme has no influence on expiring tag_me.
If you look at the previous alias removals, they all get removed when the newest post with the tag created by the alias is 2 years old. This is entirely consistant with what BrokenEagle98 said, so long as the tag doesn't get removed from images as routinely happens with tagme.
The only way in which it is as you are saying is if, when uploading post #2547972, Sacriven manually added BOTH yamagami_lucy_kimiko_akie_airi_shiori_rinne_yoshiho_ayano_tomika_chitose_sanae_mikiko_ichika AND yamagami_lucy_kimiko_akie_airi_shiori_rinne_yoshiho_chihoko_ayano_fumika_chitose_sanae_mikiko_ichika_yukino_reina_eri_ai_tamiko_chikage_emilia_julia_shizue_erina_chisa_yumeka_natsuki_ranran_rieko_setsuri_chikako_azumi_marina_hideko_chiaki_misaki_naomi_campbell_miku_yuka_masako_sachiko_nana_mutsumi_haruka_yuna_shimako_yukie_rin_sakura_kanna_wakana_hazuki_hanami_ruri_mihane_momoka_himari_nozomi_futaba_mayuyu_ayano_(ry to the post, rather than simply putting in yamagami_lucy, and not only that but the last person to upload a post with any of the tags generated by aliases removed in the thread always typed in the thing that generated the alias, no matter how unintuitive this may be.