Ad-blocker lets users opt in to viewing nondisruptive ads
Crystal, currently the No. 2 ad-blocker in the App Store, is joining the "Acceptable Ads" initiative and adding a setting for users to allow mobile ads that meet the project's standards, the app's next update will also allow users to whitelist ads on specific sites. Dean Murphy, Crystal's developer, said "by blocking all advertising with brute-force, it doesn't promote a healthy mobile Web that is sustainable and allows publishers to make a living from the free content they provide." 

In what could be seen as a positive sign for advertising pros, popular iPhone ad blocker Crystal plans to let users opt in to viewing nondisruptive ads.

The developer behind Crystal, currently the No. 2 blocker in the App Store, has announced he will join the "Acceptable Ads" initiative and add a setting for users to allow mobile ads that meet the project's standards.

Developer Dean Murphy also says the app's upcoming update, scheduled to release in the next six to 10 weeks, will allow users to white-list ads on specific sites.

Early reports of his planned update sparked some backlash against Crystal, with news sites and users calling it a cash grab: