We are unable to retrieve posts for certain users. Their accounts are not private. Examples:
1)  /public/posts?count=30&cursor=0&secUid=MS4wLjABAAAA4rLcvDZ-WyV7cdbxqJfMyi8TrfgKkW5KQ7FuQSam6v0mwwiQarH5fgt3H91ut2H6  

2)  /public/posts?count=30&cursor=0&secUid=MS4wLjABAAAAqE7g2skXMhUgeuud4TRxlpVB1zlM68ZQc4D2TB_SGImCkX88XReAgsKVVGER5anP