July 19, Kathmandu- When asked if they want iPhone users to share their data or device tracking, most users said they don't want to share their data.

In fact, this behavior of users has become a matter of concern for Facebook advertisers. In fact, advertisers have lost access to some of their most valuable and planned data.

However, advertisers were already beginning to notice a decline in the effectiveness of their ads.

Apple launched the latest version of the iPhone operating system early last month. In the new version of iOS, every app user is initially asked whether they want their internet activity to be monitored or not.

According to a study by Branch, a firm that analyzes the growth of mobile apps, only 25 percent of users are allowed to track their Internet activity.

In fact, the advertising industry has been getting energy from tracking here for years. According to mobile analyst Eric Serfat, stopping Internet users from tracking their online activities can be disastrous for Internet online businesses.

Facebook advertisers have been particularly hard-hit by the past month. According to those who run campaigns on Facebook on behalf of consumers, Facebook is no longer able to provide data on how much advertising has contributed to the sale of any product.

So now it is difficult to find out which ad is effective on Facebook.

A Facebook spokesperson declined to say what percentage of Facebook users have accepted the tracking policy. However, with 75 percent of the world's iPhone users already downloading the new operating system, tracking is now possible on only 25 percent of those using Facebook on the iPhone. If only 20 percent of users accept tracking, Seifert estimates that Facebook's revenue from the iOS app will fall by 7 percent. Similarly, if the number of such tracking permits is only 10 percent, Facebook's revenue will decrease by 13.6 percent.

According to Facebook users, Apple's operating system will experience some ups and downs with the change in iOS. But in the long run, it will not have a special effect.

According to advertisers, the loss of the ability of an advertiser to target customers who view any product online is a great loss to the advertiser.

Apple has made the latest changes to iOS a pretext for iPhone privacy. The change in privacy on the iPhone will affect not only Facebook but all app developers.

However, despite such challenges, advertisers are still not ready to leave Facebook. That means Facebook is still receiving a large number of ads.