Facebook will be merging its online advertising business with Twitter.
The announcement was made Wednesday.
Facebook is buying the Twitter-owned company for $19 billion.
That makes it the world’s biggest publicly traded social network.
Twitter is the world champion of messaging, and has had a rough time in recent years with the election of President Donald Trump and the turmoil that followed it.
Facebook is in its sixth year as a public company and Twitter’s fifth.
It also has an ad-tech business.