\"Our goal is to influence influencers to comply with those established principles in their Instagram posts,\" the FTC wrote in an accompanying blog post.

In the FTC guide for commercial practices concerning the use of endorsements and testimonials, it states that the material connection between an endorser and the seller of the advertised product must be fully disclosed.

\"A material connection could be a business or family relationship, monetary payment, or the gift of a free product,\" the FTC press release said.

But the FTC said that a number of influencer Instagram posts it reviewed left that connection ambiguous, and the disclosures were sometimes insufficient. It noted that hashtags used in some posts to denote that relationship -- including “Thanks [brand],” or “#partner” -- were not always obvious.

Ugh @sugarbearhair vitamins are so yummy and make your hair look bomb. ????#sugarbearhair #winning

A post shared by Vanessa Hudgens (@vanessahudgens) on Apr 4, 2016 at 1:42pm PDT

While not an official warning, the FTC's letters are meant to act as a reminder to influencers to stick within the proper standards for endorsing or promoting products.

Legally, it is up to both the brand and influencer to clearly disclose their marketing relationship, but the FTC said celebrities and influencers should directly make people aware of their connection and marketers should educate clients about their posts and monitor their adherence to FTC guidelines.

Aloha! ?? Took my new @MicrosoftBand for a test drive in Hawaii while rocking some handstands and arm balances. Next goal? Being able to swipe between my heart rate, calorie burn, UV index and notifications with a flick of my toes. #Sponsored #DoGreatThings

A post shared by Laura Kasperzak (@laurasykora) on Jan 25, 2016 at 9:26am PST

In its blog post, the FTC recommended three steps that influencers should take to ensure the effectiveness of disclosures on Instagram:

Keep your disclosures unambiguous.

Make your disclosures hard to miss.

Avoid #HardtoRead #BuriedDisclosures #inStringofHashtags #SkippedByReaders.

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