"They collect everything they can from FB, Instagram, and WhatsApp in order to sell visibility into people and their lives," Signal said in a blog post late on Tuesday.

Facebook, that blocked Signal from its platforms, was yet to comment on the Signal blog post.

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One of the ads Signal posted on Instagram, read: "You got this ad because you're a newlywed pilates instructor and you're cartoon crazy. This ad used your location to see you're in La Jolla. You're into parenting blogs and thinking about LGBTQ adoption".

To reveal how this targeting ad game is being performed, Signal said it created a multi-variant targeted ad designed to "show you the personal data that Facebook collects about you and sells access to".

"The ad would simply display some of the information collected about the viewer which the advertising platform uses. Facebook was not into that idea," the company noted.

Facebook immediately blocked Signal's advertising account after it aimed to run an ad campaign to show Instagram users how Facebook collects their.

Signal said that Facebook is more than willing to sell visibility into people's lives, unless it's to tell people about how their data is being used.

"Being transparent about how ads use people's data is apparently enough to get banned; in Facebook's world, the only acceptable usage is to hide what you're doing from your audience".

Facebook's own tools have the potential to divulge what is otherwise unseen, Signal alleged.

"It's already possible to catch fragments of these truths in the ads you're shown; they are glimmers that reflect the world of a surveilling stranger who knows you. We wanted to use those same tools to directly highlight how most technology works. We wanted to buy some Instagram ads," it added.

Both Signal and Telegram saw a significant uptake in new users as Facebook-owned WhatsApp's new Terms of Service and Privacy Policy triggered a fresh privacy debate.

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