Glenn FleishmanSenior Contributor, Macworld

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Glenn Fleishman is the author of dozens of books, including mostly recently Take Control of Slack Basics, a book on mastering and becoming efficient in Slack. He's a senior contributor to Macworld, where he writes the Private I and Mac 911 columns and hosts the Macworld podcast, and contributes regularly to many periodicals.

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How to fix the t.co Twitter problem

When Twitter redirects don't work.

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Error 53 has the best and worst intentions

A error that indicates your iPhone has been bricked is a good thing done wrong.

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Is there a way to sort Safari bookmarks?

A reader had her bookmarks switch to alphabetical order.

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I have multiple Apple IDs. What happens if I delete one?

Our most common questions center around managing two or more Apple IDs.

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How updating your Mac's apps could allow man-in-the-middle attacks

The popular open-source Sparkle framework for OS X updates can be used insecurely.

Podcast 494: Error 53 is only helpful to robots

Humans need more information than a two-digit number when their iPhones go dead.

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iCloud Photo Library requires copying images to the Photos for OS X app

Photos lets you reference images as well as duplicating them into its library, but it won't upload them to iCloud.

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How to manage media when migrating to a Mac with a smaller drive

Can you selectively restore files, use cloud services, and an external drive? Yes, you can!

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Reasons to love TextEdit, a secret powerhouse of rich text

A utility that dates back before OS X to Next operating systems still delivers a punch for handling text formats and converting one to another.

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How to consolidate iPhoto libraries

A reader finds many old iPhoto libraries and doesn't know what each contains.

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Podcast 493: VR hints, smaller iPhone rumors, Apple still doomed

It doesn't seem to matter how many millions of something Apple sells, or how happy the customers are—Wall Street only cares about growth.

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In short, stop using brief URLs

Once upon a time, URLs broke, texts were expensive, and space was tight. Those times are gone.

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Two issues with iCloud Photo Sharing

A reader wonders where comments go when they remove items from shared albums. Plus downloading shared items.

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When iTunes accounts intermingle: How to separate the data

A reader wants to help her loss-prone boss keep his data backed up for restoring to his string of new phones.

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How to disable mouse and keyboard low-battery warnings (you can’t)

The eternal verities: death, taxes, and OS X's low-battery warning for Bluetooth mouses and keyboards.