Don’t email huge photo files to your friends and family.

Do post pics to a photo sharing website, where you can control who sees them and whether they can print their own copies. Then just email the link.

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Don’t buy books online without trying a sample first. Do take advantage of Amazon’s free Kindle app, available on almost all major mobile devices and computers, to download a sample and see whether a book is worth your money.

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Do use descriptive subject lines when posting on Google Groups.

Don’t post your message more than once. If you post to multiple groups, then don’t send each message separately; it’ll only confuse your readers.

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Do use programs like HootSuite or TweetDeck to manage your social networks.

Don’t have people send you important messages on Facebook -- unless you log in multiple times daily.

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Do look for “https” in the address bar of an online retailer or for a padlock symbol in the lower right-hand corner. This means the site is a verified online business.

Don’t shop online via a public computer. Entering your credit card information on a computer housed in a public space makes it more vulnerable to hackers.

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Don't tell the online world when and where you took your photos.

Do turn off the geotagging features in photo sites like Flickr so your photos don't get published with information that could compromise your privacy.

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Do choose different personal security questions (aka challenge questions) for each type of service you register for online, especially with financial institutions. 
Don't choose typically asked questions like your mother’s maiden name or questions with subjective answers (e.g., “What’s your favorite movie?”) that could change over time.

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Do back up your smartphone online (e.g., with iTunes for iPhone backup) so you can easily transport your apps and contacts to a new phone.

Don’t save your data to your phone’s internal storage -- you can lose it all if your phone dies or have to re-enter it manually to upgrade to a new phone.

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Do use numbers to convey your strengths and abilities when sending a resume to an online job site. “I wrote 15 stories every day."

Don’t make up those numbers

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Do use an online file-storage service like Google Docs to save documents you need to access frequently.

Don’t rely on emailing yourself files back and forth -- you’ll forget at the time you need your files the most.

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Do use a URL-shortening service, such as bit.ly, to save space and track when people click on your links.

Don’t post long, complicated URLs that make your online posts hard to read.

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Do monitor your social networking accounts so spammers don’t take them over to send bogus messages or pleas for money to your friends.

Don't accept random friend requests on Facebook. If you do, these strangers will be able to use your personal profile data.

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Do set strong passwords by using numbers to spell words (e.g., “str8” for “straight”).

Don't use personally identifiable info like your pet's name as your password, no matter how clever it might be.

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Do use Hulu to stay current on your favorite TV shows.

Don’t keep paying for satellite or cable when you can watch TV online for free.

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Do check your privacy settings on Facebook to see who can view your profile.

Don’t fall for the rumor floating around Facebook status updates that you can safely download an app to see who viewed your profile.

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Do stop the minute you see a fake alert, shut down your browser and perform a full scan with the legitimate antivirus product.

Don’t fall for a random pop-up window that claims your computer is infected with a virus.

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Do make sure the payment site begins with “https:” to stay secure when buying online.

Don’t buy from sites that don’t provide an actual address and telephone number.

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Do use your device in meetings, but let the participants know before doing so; you don’t want them to think you’re ignoring them. Just say, “FYI, I’m going to take notes on my iPad.” Don’t get annoyed when strangers ask you about the mobile device you’re using. With so many new options out there, it helps to get an opinion from a real person.

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Do use Facebook wall postings for quick hellos or comments. Don’t have entire conversations on a friend’s wall. That’s just annoying for your friend, who has to answer in that small space, and the rest of your friends who have to see it in their feeds.

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Do send a note via email if you aren’t close enough to the person to call them.

Don’t use Twitter or Facebook to offer your condolences if the person hasn’t posted about their loss.

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Do use the bcc function when emailing a long list of people to protect your list’s privacy.

Don’t skip the subject line, but do keep it brief.

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Do buy an iPhone in the fall or winter. Apple usually releases a new version in June or October.

Don’t buy it in the summer. It’ll probably be an older model, and you’ll pay the same price that you would if you were to just wait for the new version.

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Do increase your blog traffic by submitting your blog to such directories as Bloggeries, Bloggapedia, Technorati and Blog Search Engine. Don’t continually respond to a negative comment or post that a reader makes on your blog. While this can increase your search engine rankings, it will also draw more attention to the unwanted comment.

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Do check for updates of your downloaded apps in the Android Market to ensure you’re running the most current versions. Don’t allow tablet or smartphone devices to access your personal data unless you know specifically why they need to.

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Do lock your screen (Ctrl+Alt+Del) to protect your info whenever you leave your PC on but unattended.

Don’t leave your iPad or iPhone unprotected if you have sensitive company data on it. Keep your info safe by using the Passcode feature.