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[Dagny Westall]

Thetwo-hour-long program has been a staple on Friday evenings (currently airing at 9:00 p.m. Eastern Time Zone) for much of the time since it moved to that timeslot from Thursdays in September 1987, though special editions of the program occasionally air on other nights. For most of its history, it was led into by ABC's two-hour TGIF block of sitcoms.

Since 2019, it has shifted to a two-hour format highlighting true crime stories and celebrity scandals rather than the traditional investigative journalism associated with newsmagazines, following the same programming direction as CBS's 48 Hours and same-night competitor Dateline NBC. Special edition episodes, however, cover a wide range of topics.

The anchors on the premiere telecast of 20/20 were Esquire magazine editor Harold Hayes, who also served as the program's senior producer, and Time art critic Robert Hughes. The program's debut received largely harsh reviews; The New York Times described it as "dizzyingly absurd" and The Washington Post denounced it as "the trashiest stab at candycane journalism yet." In his autobiography Roone: A Memoir, Roone Arledge recalled that probably the most embarrassing part of that initial program was the Claymation segments featuring caricatures representing then-President Jimmy Carter (singing "Georgia on My Mind") and Walter Cronkite (closing the program intoning, "That's the way it was"). As a result of the scathing reviews, serious and drastic changes were immediately made: Hayes and Hughes were fired (as was original executive producer Bob Shanks), and a then semi-retired Hugh Downs was recruited to take on the role of sole host on the following week's program.

Also featured in the premiere telecast of 20/20, the opening sequence consisted of a pair of eyeglasses, whose lenses showed colored bars, which are often seen in the SMPTE color bars (used when television stations were off the air between sign-off and sign-on). The eyeglasses were keyed over a yellow background, and rotated to its rear position to reveal the 20/20 studio.

Barbara Walters joined the program in 1979 in a role something less than a co-anchor and soon became a regular special contributor in the fall of 1981. In 1984, she was named as co-anchor and thus Hugh Downs's equal, reuniting a duo which had already anchored together on NBC's Today from 1964 to 1971. The team would remain together on-air for the next 15 years.

On March 3, 1999, Monica Lewinsky, the former White House intern who was infamously revealed to have been involved in an affair with then-President Bill Clinton a few years earlier, was interviewed by Barbara Walters on the program; that particular edition of 20/20 was watched by an estimated 70 million viewers, which ABC stated was a record audience for a news program.[3]

On August 25, 2008, 20/20 (alongside ABC World News and Nightline) began broadcasting in high definition, with broadcasts presented in a pillarbox format for viewers with standard-definition television sets watching either through cable or satellite television. The program also introduced a new set and upconverted its existing graphics package to HD.[4]

In September 2009, before the start of its 31st season, John Stossel announced he would leave the program after 28 years to pursue a new weekly show on Fox Business.[5] Barbara Walters and Diane Sawyer also contributed reports. On December 10, 2009, ABC News announced that Good Morning America news anchor Chris Cuomo was promoted to co-host 20/20 alongside Elizabeth Vargas. On January 29, 2013, it was announced that Chris Cuomo would leave ABC News and 20/20 for CNN to co-host the cable network's new morning news program, New Day; on the same day, ABC announced David Muir would join Elizabeth Vargas as the new co-anchor of the program, in addition to continuing as weekend anchor of ABC World News Tonight (a role he retains after being appointed to main anchor of the since-renamed ABC World News Tonight in September 2014).

The program expanded once again on March 2, 2013, with the debut of 20/20 Saturday, which mainly features rebroadcasts of archived stories from previous editions of 20/20 (mainly those dating back as early as 2008) in the same single topic format as the flagship Friday broadcasts. 20/20 Saturday airs outside of college football season, at either 9:00 p.m. as a two-hour broadcast formatted as separate hour-long episodes centered on two different topics or at 10:00 p.m. Eastern Time as an hour-long broadcast, depending on the programs that precede it that given week. Barbara Walters originally served as host of the program until her retirement from regular television broadcasting in May 2014, after which the hosting duties were turned over the anchors of the Friday editions.

The December 30, 2022 edition of the program was interrupted in the Eastern and Central time zones by news of Barbara Walters's death around 9:30 p.m. ET, and anchor Phil Liphof anchored coverage for 90 minutes with ABC News's official obituary and comment from other ABC News staff about her life and impact.

Unlike most other newsmagazines, 20/20 Downtown was never carried by any big name anchor. An ensemble team of anchors fronted the broadcast, which was aimed at attracting younger viewers, but was hampered by many of the network's larger market network affiliate stations bumping the program to late night or weekend timeslots to accommodate local pre-game shows or coach's shows/highlight recap programming dealing with NFL or college football teams preceding ABC's Monday Night Football. The anchor/reporting duties were filled by the team of Elizabeth Vargas, Cynthia McFadden, Chris Cuomo, Jay Schadler and John Quiones. The program was renamed Downtown but was canceled in 2002. In 2003, the program returned for one season as Primetime Monday, with the same anchors and format.

Even though 20/20 still occasionally uses a multiple topic format, the program has seen a gradual shift towards single topic editions since the late 2000s (similar to what has occurred with Dateline NBC since around the same timeframe, although continuing to include a wider range of topics), either in the form of various story packages that relate to the topic or a focus on a single story.

The GloMax 20/20 Luminometer was a workhorse for many years, but as of September 1, 2023, we are retiring this instrument model. All accessories will continue to be available, as will instrument service, until September 1, 2028.

We kindly invite you to review your current and future laboratory needs relative to your GloMax 20/20 Luminometer. If you have any questions or would like an assessment based on your laboratory and budgetary needs, contact your local Promega Sales Representative today or visit us at: www.promega.com/CompareGloMax to learn more about our new products.

The GloMax 20/20 Luminometer combines instrumentation and software in a complete solution that includes bioluminescent assays, protocols and support. In addition to high performance, the GloMax 20/20 blends user-friendly operation and a small footprint with flexible purchasing options. The result of this design is an ultrasensitive instrument with superior performance that is easy to use, affordable, and can be customized to your lab's needs.

To achieve the GloMax-20/20's high sensitivity, the luminescence channel is positioned directly below the sample well. These conditions maximize light capture. In addition, a low-noise photomultiplier tube ensures that collected light is not compromised. The dynamic range of the GloMax-20/20 is more than adequate to cover common luminescence applications, thus reducing the need to dilute samples.

The GloMax-20/20 Luminometer Light Standard provides an external control to verify performance. Some labs require this additional verification procedure. Reading the light standard before taking measurements is a quick and easy way to ensure quality control of reproducibility, sensitivity, and linearity of measurements.

Optional Fluorescence Modules add functionality to the GloMax-20/20. The modules are designed to measure common fluorescence applications using excitation wavelengths in the near UV or Blue light range. The Fluorescence Modules provide sensitive measurements of DNA, RNA, or protein quantitation dyes.

The GloMax 20/20 Light Standard is designed to provide a quick and easy way to verify the performance of the GloMax 20/20. It allows you to check the reproducibility, sensitivity and linearity of a luminometer in less than 30 seconds. The Light Standard consists of three highly stable light sources that simulate luminescence samples at three different signal levels. It can be used for both short-term and long-term stability studies of the detection system.

The GloMax 20/20 Spreadsheet Interface Software is provided on a CD and is easy to install. You only need to have an available serial port to connect to the GloMax 20/20. You must have MS Excel installed on your computer.

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As I thought about this a little more, it brought me full circle to the struggle that social media folks have in convincing their brands/employers that social media is not a soapbox. It's not a press release. It's not a steady stream of feature updates.

Has anyone ever heard about the 80/20 rule? This rule states that in social media, you 80% of the content you share should be helpful and useful content FOR YOUR FANS and then 20% should be promotions, updates, and things that you want to say.

I'm going to postulate a new rule. I'm going to call it the 60/20/20 rule. I feel like 60% of your content should be that helpful content that engages and is FOR YOUR FANS. Then the 20% for the stuff you want to say (promotional.) But 20% (at least) should be using content FROM YOUR FANS.

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