i hope it’s alright for me to add some of my observations because i just spent the past two weeks blocking terfs upon terfs from a post of mine that blew up (there were a few of their blogs that i went through to grab more urls; whoever they were reblogging from regularly and some of the blogs that were recommended by tumblr for being similar to them):
a blog might be run by a terf or party to the platforming of terf rhetoric…
if they refer to themselves as “radfems” (or “RF”) “gender critical” (“GC” for short) or as terves, terven, being “biologically female” or a “biological woman” or “biological lesbian”, tehm (trans-exclusionary homosexual male), febfem, vixenamoric, or “gold-star lesbian”
if they place strong emphasis on “believing in science/biology” and being a “real” “female” lesbian (you may also observe a lot of blatant butchphobia coupled with this sentiment; demonization of masculinity and condemnation of “glorifying” masculinity or “maleness”) - to a lesser degree, some covert terfs use “critical thinker” as a stand-in for “gender critical”, and “chromosomal woman” or “XX” or “womban/wombyn” to denote chromosomes and uteri
if they post a lot about the “nordic model” (re: “ending prostitution”), being strongly anti-porn and anti-sexwork, often refusing to call it sexwork and instead referring to it as sex trafficking (to lump consensual sexwork in with actual sex trafficking) - while not all swerfs are transmisogynists or transphobes, many terfs are swerfs
if they fixate on, as the addition prior to this one mentions, “all men being predisposed to violence” and are insistent that men are also inherently rapists
if they, as shown in the screenshots above, refer to trans-inclusive feminists as “libfems”
if they make posts or share ‘articles’ (always by obviously disreputable news outlets) about ‘high numbers’ of trans people being pedophiles or sex offenders (by the way, this is why terfs in the uk are trying so hard to make trans health records public, including supporting health secretary sajid javid’s intentions to allow researchers free access the private medical history of trans people, including trans minors - they genuinely, seriously believe that there is no difference between being transgender and being a sex criminal and they want there to be a public list of trans people like there are sex offender registries)
if they post shit like “terf is a slur against lesbians” and “when they say no terfs they mean no lesbians” - often labeling themselves as “political lesbians” or “lesbian separatists” (i.e. “get the L out” and “drop the T”) and identifying strongly with regressive waves of feminism
if they talk about autogynephilia like it’s a real or valid thing (and not the ramblings of a literal white supremacist)
if they refer to LGBTQ+ educational material (presentations, literature, videos, etc.) as “tra propaganda” or “brainwashing” or “misogynist conditioning”
if they talk about trans women being “socialized male”
if they post a lot about female genital mutilation (FGM) in combination with consistently trans-exclusionary language and other dogwhistles or warning signs from this list, additionally referring to top surgery (or gender-affirming mastectomy), chest binding, and phalloplasty as FGM
more information on how to identify and combat terf ideology can be found here