日本語 Japanese Ask Questions Thread 4

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.


Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

Japanese Ask Questions Thread3
http://dis.4chan.org/read/lang/1267485093/1-40

>>43
＞だれかが

Wait. Genki stated that 誰か is not to be used together with は、が、も particles(lessons 8,10). However after seeing >>43 post I googled and looks like it's used:
"映画『誰かが私にキスをした』公式サイト".
Tae Kim's guide uses 誰かが too (http://www.guidetojapanese.org/learn/grammar/question)

So what does it mean? Have I been trolled by genki? Or ga/ha/wo can be omitted optionally?