computer science

Jack'd

Jack'd is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jack'd rather than just read about it. In short: Jack'd is a location-based chat and dating app catering to gay and bisexual men. It is available for Android, iPhone, and Windows phones.

Key takeaways

Jack'd belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Jack'd to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Jack'd from memory before moving on to harder problems.

Reference excerpt

Jack'd is a location-based chat and dating app catering to gay and bisexual men. It is available for Android, iPhone, and Windows phones. Jack'd was previously owned by Online Buddies, owner of Manhunt. In 2019, Perry Street Software, the parent company of Scruff, bought Jack'd for an undisclosed sum.

Controversies On June 13, 2016, the Los Angeles Times reported that Omar Mateen was a Jack'd user for at least a year prior to the Orlando nightclub shooting in which he killed 49 people and wounded 53 others. Jack'd was not able to substantiate those claims. On February 5, 2019, technology news outlet The Register reported a security flaw in the app in which users' private photos could be publicly viewed by anybody aware of the flaw. On February 7, 2019, Jack'd fixed the bug. On June 28, 2019, the Office of the Attorney General of New York announced that Online Buddies, Inc. will pay the state $240,000 to settle the privacy complaint and that the company would implement a "comprehensive security program" to prevent similar incidents in the future. In a statement, New York State Attorney General Letitia James said, "[Jack'd] put users' sensitive information and private photos at risk of exposure and [Online Buddies] didn't do anything about it for a full year just so they could continue to make a profit."

See also Homosocialization JOYclub Timeline of online dating services Tinder

References

Worked examples

Example 1 — a first encounter with Jack'd

Start with the simplest possible case. Write down what Jack'd claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jack'd before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jack'd ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jack'd

In research: Jack'd appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jack'd in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jack'd is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2010 software, Android (operating system) software, Geosocial networking, so understanding it makes those chapters shorter.
In everyday life: Look for Jack'd outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jack'd in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Jack'd means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Jack'd out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jack'd in simple terms?

Jack'd is a location-based chat and dating app catering to gay and bisexual men. It is available for Android, iPhone, and Windows phones.

Why does Jack'd matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jack'd?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jack'd.