Though the photo and video sharing site Flickr.com has been overshadowed by Instagram, it is still a powerfully popular and useful site for photo hobbyists and professional photographers, as well as a worldwide gallery of some of the most beautiful photos ever taken. Flickr was launched and became popular as a website back in 2004. But now, probably the more convenient way to access and browse the site is on mobile devices like the iPad.

If you have amassed several hundred or thousands of PDF documents like I have, you probably have experienced the challenge of managing and accessing them in various folders on your computer. Since I have gone practically paperless in my day-to-day workflow, an application like PDF Stacks ($39.00) is one I should have started using a long time ago. We’re giving away 25 copies of PDF Stacks for both PC and Mac. Find out how you can win one after the review.

So you want to text someone a private flirty or goofy photo or video of yourself, but you know that images and videos can be shared and circulated on the Internet very quickly. Well it seems that a very popular iPhone and Android app called Snapchat might be a simple solution for texting your kinky photos without them being released to the wider public.

The Twitter-owned blogging and community site, Posterous.com announced last week that it will be closing down and turning off its online and mobile apps on April 30th, and from then on will no longer be available either to view or to edit. Users are advised to back up their posts now.

We here at MakeUseOf try to highlight the best and most useful tips and tricks for using the latest version of Apple’s iPhone, its most current operating system, iOS 6, and even how to’s for better iPhone photography and videography. But if you are a beginner on iPhone, or you just haven’t had time to learn how to get the most out of the device, you might want to check out the well designed magazine app, iPhone Secrets.

RSS feed readers are still the best way to access and manage your favorite website article updates and topical interests. And while I recommend Google Reader as the best baseline RSS feed manager, attractively designed Mac desktop and iOS mobile applications like Reeder for the iPad ($4.99) make the browsing and reading experience even better.

The purpose of this article is to introduce you to the basic ways to browse and download apps for your Mac, iPhone, iPad, and/or iPod touch. If you are an experienced user of Apple devices, you might want to pass this article along to beginners who might be bugging you about where to find the best and most popular apps for their Apple device(s).

If you’re an iPhone user who regularly attends conferences and social networks in which you collect business cards, or the names and email addresses of people you meet, you definitely should check out the newly revised and updated free Evernote Hello 2.0. Evernote Hello made it to the list of my top 10 favorite apps of last year. But its 2.0 update deserves a full review for the useful features it now includes.

The default Mail client for the iPhone has become in my opinion outdated, or it’s certainly not as advanced as the hardware it resides in. Mail is not fun to navigate, and its latest features don’t provide much of a productivity boost. But the just released popular third-party email client, Mailbox (Free), may make Apple’s Mail client feel like a third-rate piece of software.

Working collaboratively on projects involving computer software, or helping people troubleshoot problems on their computer is common practices these days. We have published articles about several software programs that enable Mac and PC users to share their screens via a network or online. As the demand for screen sharing increases, the software and features for doing so should improve.

In the spirit of Valentine’s Day in the US, the leading online bookseller Amazon has posted an interactive webpage titled 50 Great American Love Stories, which consist of novels selected by Amazon editors whose setting take place in one of 50 states in the union.

The much-anticipated iPhone app, Mailbox, has just been posted in the App Store this week. Interested users will need to reserve a free access code in order to use the app on their iPhone.

We have published articles about the non-profit TED Conferences, including the Best of TED talks and TED’s Top 20 Most Watched Videos. The presentations are wide ranging, from Colin Stoke’s “How movies teach manhood” to Adam Davidson’s “What we learned from teetering on the fiscal cliff.” If you are a fan of TED talks, you might be interested to know that the catalog of “ideas worth spreading” can also be accessed in an official app for the iPad.

Springpad and Evernote are awesome file cabinets for storing and managing articles, recipes, products, and text clippings we want to save for later review. But an additional way to maximize these powerful notebooks is to make use of their collaborative sharing features. These days, when it comes to working collaboratively on computer-related projects, notes, files and documents, doing so via email can become time-consuming, and even counterproductive.

If one of your New Year’s resolutions is to do better at budgeting your money and monitoring your personal finances, Mint.com is one of the best ways to meet these goals. This popular and well-established online and mobile service can help you keep track of your spending, and offer you advice about making better financial choices.