i have two queries:

1. which app is the best to lock various apps (FB, Opera, etc) in my xperia L?

2. how do i sort my pics in the album according to the latest date. now recently i changed my memory card & after changing i find that my pic aren't sorted according to the date they were taken on. is there any way to sort with the most recent one being the first one in the album?

and also how do i select memory card as my ONLY storage for the pics? the current pics are saved in internal memory.