That didn't take long!

On the same day Facebook Inc. announced in a post on the company's blog that it discovered a security breach affecting almost 50 million accounts, the company was hit with a breach-related lawsuit.

Attorney's in Morgan & Morgan's complex litigation group in Tampa and the Arnold Law Firm in Sacramento filed a class action lawsuit Friday against the company in the Northern District of California.

Read the complaint below:

“It is shocking that after all the publicity surrounding Facebook's handling of personal information in the wake of Cambridge Analytica and its promises to do better by its users that Facebook has yet again failed to protect consumers' information from hackers,” Morgan & Morgan's John Yanchunis said in an emailed statement.

Morgan & Morgan colleagues Ryan McGee and Jean Martin were listed with Yanchunis on the complaint.

A Facebook representative declined to comment beyond the previous post on the company's blog authored by Facebook vice president of product management Guy Rosen.

“Since we've only just started our investigation, we have yet to determine whether these accounts were misused or any information accessed,” Rosen added. “We also don't know who's behind these attacks or where they're based. We're working hard to better understand these details — and we will update this post when we have more information, or if the facts change.”

Yanchunis also served as lead counsel in multidistrict litigation brought on behalf of the 3 billion Yahoo account holders affected by data breaches. Yahoo settled a series of data breach class actions earlier this month, setting aside $47 million in restitution and $80 million for related shareholder lawsuits.

Yanchunis has made a name for himself in other class actions. He is leading an Exactis class action filed in June claiming a data breach affected 230 million Americans and 110 million businesses, sued SunTrust in May over a data breach that allegedly affected 1.5 million customers and was involved in a settlement over melting dashboards in Nissan Altimas.