Facebook Inc. and eBay Inc. responded to a request from the U.K.'s Competition and Markets Authority to tackle fake and misleading reviews on their platforms.

Facebook removed 188 groups and disabled 24 user accounts, while eBay permanently banned 140 users, according to a Jan. 8 news release. The companies also agreed to implement measures to prevent having such kinds of content on their platforms.

Facebook intends to introduce more robust systems to detect and remove such content. Meanwhile, eBay upgraded its existing filters to help identify and block listings for sale or exchange of online reviews.

Facebook also pledged to investigate an issue of fake and misleading reviews being offered on sale through Instagram.