Q. I know how to delete a Facebook comment using the web version, but how can I do the same thing on the Android app?

A. Facebook’s mobile apps have less space for menus and icons than the desktop edition does. When you are using the Android app and want to delete a comment you posted (or that someone else posted to your own Timeline page in response to one of your posts), press and hold your finger down on the comment. When the menu appears, tap the Delete option.

For those times when you just want to reword a previously made comment, press the text on screen for a second or two until the menu arrives and select Edit. Once you have fixed your typo or clarified your remarks, tap the Update button. The process for deleting and editing comments is similar on Facebook’s iPhone app.

Seeking Control of the iOS Control Center

Q. Is it possible to change the icons on the Control Center screen in iOS 8? Some of the shortcuts, like Airplane Mode, are handy, but I never use the Do Not Disturb or Timer functions and would rather put more useful settings there.