Native Speakers via Wikipedia:
Arabic 295 million
Spanish 405 million
Russian 155 million
German 120 million
French 75 million
Polish 40 million
Thai 20 million
Greek 13 million
Serbian 9 million
Romanian 24 million
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Portugese 215 million
Japanese 125 million
Italian 59 million
Turkish 63 million
Malay 77 million
Indonesian 20 million
Mandarin Chinese 955 million (but facebook blocked from China)
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English 360 million