By Ian Randall For Mailonline
Published: 17:54 GMT, 8 November 2019 | Updated: 18:45 GMT, 8 November 2019
If Twitter is anything to go by, the last steps measured by many Fitbits over the past week were taken to the fitness trackers' final resting place — the bin.
Unhappy Fitbit users announced they were ditching the devices over privacy concerns following Google's purchase of the activity tracking firm on November 1.
San Francisco-based Fitbit Inc, which boasts 28 million worldwide users, was purchased for $2.1 billion (£1.6 billion).
In response, many Fitbit users threatened to switch to other wearables instead — including smart watches made by rivals Apple and Garmin.
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Unhappy Fitbit users announced they were ditching the devices over privacy concerns following Google's purchase of the activity tracking firm. Pictured, the Fitbit Versa 2
Unhappy Fitbit users threatened to switch to rival trackers such as those by Apple and Garmin
Fitness trackers such as Fitbits or smart watches monitor heart rate using a technique called photoplethysmography.
The tracker sends green light through the skin which is partially absorbed by arteries.
As you exercise, these arteries expand as blood flow increases - meaning more green light is absorbed rather than reflected back to the tracker.
The tracker estimates your heart