Facebook Has Deleted 5 to 10M Links to Competing Social Network
zdnet.com
zdnet.com
Most of that info I got from the article, but I also Googled a bit.
Tsu had problems with spam on its own site, and it was also likely spamming Facebook, which its founder admits in the article.
There's also some evidence that Tsu.co or its advertisers were distributing malware[1].
> Disclosure: I joined Tsu as a user to take a look at the site before I wrote about the platform in 2014 and I still use the platform regularly.
That's a damn fair use of a disclosure.