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Throwback Thursday or #TBT is an internet trend used among social media platforms such as Instagram, Twitter and Facebook. On a Thursday, Users will post nostalgia-inducing picture – from a different era of their life, accompanied by the hashtag #TBT or #ThrowbackThursday. Many posts reflect positive moments, or funny, old clothes, hair and styles. Throwback Thursday can be attributed to any photo in one's past memories whether it be childhood, old relationships, past vacations, old songs, or anything that gives one a "happy and nostalgic feeling."
Like many internet trends, it is hard to determine who exactly started the #TBT hashtag trend. The earliest usage on instagram was by a @bobbysander22.Sports Illustrated attributes the origin of the term to a sneaker-specific blog named Nice Kicks. According to SI, this blog began a practice of regular postings (on Thursdays) of photos of old basketball footwear in 2006, titling the series "Throwback Thursday". Since then, the slogan has blown up to the point where #TBT has been used on Instagram over 500 million times. While the trend has origins outside of social media, it only gained popularity once major apps such as Instagram began to rise in popularity as well. 
Similar to Throwback Thursday, Flashback Friday was a popular hashtag several months before Throwback Thursday was. Although both hashtags are similar, what makes them different is the days in which one can post a nostalgic picture. Flashback Friday is a second chance for social media lovers to upload a photo if they have forgotten on Thursday, or even for people to upload more vintage photos that allows them to share their content as many times as they want. On Fridays, social media users should use the hashtag #flashbackfriday or #fbf to follow the trend.
- Gannes, Liz (2014-05-01). "Throwing Back to the Origins of Throwback Thursday". Recode. Retrieved 2017-08-11.
- Knibbs, Kate (2013-05-30). "Everything you need to know about your favorite day: Throwback Thursday (er, #tbt)". Digital Trends. Retrieved 2020-08-06.
- Sin, Ben (22 August 2013). "From Hardwood to Hashtag: How NBA Culture Gave Rise to Throwback Thursday". Sports Illustrated.
- Moreau, Elise. "What's the Difference Between Throwback Thursday and Flashback Friday?". Lifewire. Lifewire. Retrieved 27 March 2017. CS1 maint: discouraged parameter (link)