Mark Mahaney of RBC Capital Markets said Snap is on the right track, especially with its redesign and ad platform.
Shares of Snap plunged another 2 percent Friday after Rihanna instructed her 60.9 million Instagram followers to delete the app.
Facebook, the second largest online ad provider after Google, took similar action in January.
Jefferies reiterates its buy rating on Amazon shares, predicting the company's ad business sales will surge over the next five years.
More than 180 of the most senior female ad executives in North America have formed Time's Up Advertising, an anti-harassment campaign and legal aid fundraiser.
An advertisement prompting British businesses to "leave post-Brexit fears behind" and move to Normandy in France has been banned by London's transport authority
With more people buying tech-enabled household objects, it's "expanding the surface of vulnerability" Warner said.
Advertisers want to know where their ads are running on Facebook, and the company has yet to widely provide solutions.
Fake news joins terrorism, hate speech and child exploitation among advertiser concerns on social media.
WPP saw its market capitalization fall $2.6 billion after it reported flat 2017 results Thursday. CEO Sorrell cited several reasons for the lack of growth.