Notably commentary (with references, some of which I'll link below but others are in the thread) around how its EW suite that includes the dedicated EW system, the 1600+ T/R module AN/APG-81 radar, and a combination of embedded arrays, and towed decoys for self-protection. The EW capabiltiy is highlighted by users the most but is also the most restricted in terms of shared information, but the twitter handle does a pretty good job of getting some known information out there, and also combing through what Northrop Grumman and BAE has been doing in terms of research and development going back many years (as it pertains to radar and ew).
Some snippets from the thread linked above and some additional thoughts from em
On 3, worth noting that the original JSF design allowd for the receiver footprint to be doubled without requiring significant airframe changes. They left room for arrays to be added in the wings, landing gear doors, and the rear aspect of the aircraft. The Block 4 program, that is currently being executed adds about 8-10 additional arrays for a total of 20 receivers on the F-35A, B and C models. These will be cut into production in 2024 production year, or 2025 delivery year. Older aircraft will receive these as upgrades.1/"There’s limited public data on extent of F-35’s EW capability but there are two areas we know that F-35 enjoy significant advantage over E-18 Growlers in the EW domain".
2/ "Locating enemy radars. A single F-35 can locate, identify, and triangulate emitter locations faster with greater precision than three F-16CJ surrounding the emitters". LINK
3/ "Where most 4th gen. aircraft have 3 to 4 receivers, the ASQ-239 on F-35 has 10 receivers with 6 of them in the forward hemisphere".
7/ "Second important area where F-35 has advantage is jamming power. APG-81 radar is integrated with EW suite and is primary transmitter for all Electronic Attack operations. A massive AESA radar as primary jammer has significant advantage in terms of effective radiated power".
8/ "This due to ability to form tightly focused beams. The amount of radiated power on target depends on the size of radar beam or beam width. Wider beam, bigger area radiated power is spread and smaller radiated power per square km".
14/ "In case you’re wondering that F-35 radar could only jam X band radars. Nope, an AESA radar designed for EW role can perform broadband jamming. This is a 1987 patent of an X band AESA radar performing ECMs across L through Ku band".
15/ "This doesn’t make F-35 a better EW platform than Growler for several reasons, the biggest of all being that Growlers can carry Low-band ALQ-99 pods that can provide stand-off jamming against Early Warning radars".
18/ "F-35 with -40 dB RCS require 1/10,000th jamming power of modern 4th gen and enjoy 100 times smaller burn-through range given same jamming power. This explains why using jamming doesn’t necessarily compromise stealth, rather makes it much worse for the enemy radars".