In Europe what I§ve seen all the lower wattage sockets (below 40W or so) which were bakelite (= phenolic resin with a wood dust as the filler) moved to plastic (looks to me like ABS), medium wattage (60..75) which were combination bakelite (base) and porcelain (threaded part) became plastic + porcelain, only the high wattage (100W and above) were completely ceramic. No paper insulation here, even the "metal shell" types (the small E14 ones with brass decorative outer surface) have a plastic insert socket within the metal shell. Probably because European code requires to count for the lamp thread to be at the phase potential, where the paper won't guarantee sufficient safety.
With the LED's I would rather guess either the plastic, or (where the safety code allows) the metal+paper (as a "no plastic used" hype)...
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