@Vitali,
@JD,
@Longdan,
@alex_hk90
There are about 190 Expert entries at the moment, we're about to add another 70 very soon. John is going to make an announcement here with more details. Re: German. We are going to do that, but it's on hold at the moment. We were in talks with a translator, but he disappeared into China. We do have semantic component posters in German that are currently available.
And, word etymology resources are fairly sparse, even in Chinese. We don't have any plans in the near future to do that. That would require a complete retooling.
Book-wise, James Matisoff's
Handbook of Proto-Tibeto-Burman has some in it, but it's tainted by the fact that he bases things on Karlgren's OC reconstruction. One of the major issues being there are no -- or almost no-- open syllables in Karlgren's system. So, words that would be *
ka in Baxter92, Baxter & Sagart 2014, 王力、鄭張尚芳, etc. would be *
kak (or *
kap, *
kat depending on the rhyme group) in Karlgren's system (as it would in 李方桂). Needless to say, having that extra consonant at the end could make unrelated words look related, and related words look unrelated. I've not actually evaluated the quality of Matisoff's Chinese etymologies, but I don't see how using Karlgren's OC can do anything but have a negative effect.
王力《同源字典》 despite the name is basically about word etymology. His 《古漢語字典》 points those things out as well.
吳安其《漢藏語同源研究》2002 (You could get some Chinese word etymology from this, but it's not going to be direct.)
姚榮松《古代漢語詞源研究論衡》(This looks like what you want, but I've never read it, so I can't say anything about it's quality.)
One more thing to point out, those are all dealing with the etymologies of ancient words, which is a completely different question from how did the word 社會 come about. The Taiwanese MOE online dictionary does show quotes from ancient texts for words, so that might be a place to start (assuming you already read Chinese). However, I'm not sure what process they used for those quotes, so they may not represent the earliest uses.