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i can't replicate your issue :) i tried to login into your website
www.miitter.com/es
and i can post status and also filter on activity stream on frontpage.. maybe you can explain more specific about this issue ? (maybe specific user, or on specific page)
By the way, can you provide me your cpanel i need inpsect your database, i saw some warning on your frontpage like below :
"Advertencia
JUser: :_load: No se puede cargar usuario con el ID: 10
JUser: :_load: No se puede cargar usuario con el ID: 14"