upload photo code for facebook iframe tab - facebook

we are trying to add an upload image button on our facebook iframe tab. When user clicks button it will pop up an upload photo box. Which then the photo would be inserted into a photo gallery. I have seen this done but do not know how to do it.

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change Facebook share preview image

I have a web page that has a share button and this button shares posts that are on the page. I want to change the preview image when sharing the post. I have meta og:image and it picks up image from there but I want to change and add image as in the screen
I tried everything that saw on google but I could not do what I want

Hide images on Facebook share

Is there any way to do NOT display any images on FB share dialog?
I checked No Thumbnail in Debug but it doesn't affect on the page. I left meta og:image is empty for the content attribute as well.
I only want to display TEXT ONLY share dialog.
Any ideas?
Thanks!

iOS UIWebview facebook sharer.php catch share event

We use sharer.php in a UIWebview in our app, since it enables very easy sharing with customized title and text and thumbnail without having to go through the process of setting up (and maintaining!) a facebook application (and we'd like it to stay that way).
Only problem is, that we'd like to programmatically close the UIWebview once the user clicks the share button.
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allow user to select image for facebook like button

Is it possible to let a user pick which image for the "Like" post they will create when using a like button on a site? I specified multiple og:image tags and the facebook linter is correctly displaying all the images, but when I click the like button, it doesn't give the option to pick which image I'd like to use.

FBGraph Login page issue with "done" and "login" button

I am using FBGraph to get user's friends list in my application, After entering user credentials in login page of FaceBook, when I tap "Done" button in keyboard and tap again on "login Facebook" button it is moving to user profile page in webview.
My requirement is after successful login in FaceBook ,the webview has to dismiss and open user's friends list in tableview.
I have reached my requirement if I tap anyone of these two buttons but I need the same output when I tap two buttons simultaneously.
now the output screen shot is as shown in the below attachment.