http://www.washingtonpost.com/blogs/the-switch/wp/2017/10/24/amid-russian-investigation-twitter-is-making-all-of-its-ads-public/

SAN FRANCISCO — Amid federal investigations into Russian meddling in the U.S. election, Twitter is making all of its ads public, along with who published them and how much was spent, the company said Tuesday.

The move, which follows a similar decision by Facebook, is aimed at adding greater transparency to the largely opaque world of online political advertising. It also may offer some cover for Silicon Valley companies that have come under scrutiny over the role they unwittingly played in allowing a massive Russian disinformation campaign to spread on their platforms.